Use tr:: instead of langFactory in box titles.

Telegram/SourceFiles/boxes/about_box.cpp

@@ -58,7 +58,7 @@ AboutBox::AboutBox(QWidget *parent)
 }
 
 void AboutBox::prepare() {
-	setTitle([] { return qsl("Telegram Desktop"); });
+	setTitle(rpl::single(qsl("Telegram Desktop")));
 
 	addButton(langFactory(lng_close), [this] { closeBox(); });
 

Telegram/SourceFiles/boxes/abstract_box.cpp

@@ -16,9 +16,14 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/labels.h"
 #include "ui/widgets/shadow.h"
 #include "ui/wrap/fade_wrap.h"
+#include "ui/text/text_utilities.h"
 #include "mainwidget.h"
 #include "mainwindow.h"
 
+void BoxContent::setTitle(rpl::producer<QString> title) {
+	getDelegate()->setTitle(std::move(title) | Ui::Text::ToWithEntities());
+}
+
 QPointer<Ui::RoundButton> BoxContent::addButton(
 		Fn<QString()> textFactory,
 		Fn<void()> clickCallback) {
@@ -310,18 +315,10 @@ void AbstractBox::parentResized() {
 	update();
 }
 
-void AbstractBox::setTitle(Fn<TextWithEntities()> titleFactory) {
+void AbstractBox::setTitle(rpl::producer<TextWithEntities> title) {
-	_titleFactory = std::move(titleFactory);
+	const auto wasTitle = hasTitle();
-	refreshTitle();
+	if (title) {
-}
+		_title.create(this, std::move(title), st::boxTitle);
-
-void AbstractBox::refreshTitle() {
-	auto wasTitle = hasTitle();
-	if (_titleFactory) {
-		if (!_title) {
-			_title.create(this, st::boxTitle);
-		}
-		_title->setMarkedText(_titleFactory());
 		updateTitlePosition();
 	} else {
 		_title.destroy();
@@ -350,7 +347,6 @@ void AbstractBox::refreshAdditionalTitle() {
 }
 
 void AbstractBox::refreshLang() {
-	refreshTitle();
 	refreshAdditionalTitle();
 	InvokeQueued(this, [this] { updateButtonsPositions(); });
 }

Telegram/SourceFiles/boxes/abstract_box.h

@@ -30,7 +30,7 @@ class BoxContent;
 class BoxContentDelegate {
 public:
 	virtual void setLayerType(bool layerType) = 0;
-	virtual void setTitle(Fn<TextWithEntities()> titleFactory) = 0;
+	virtual void setTitle(rpl::producer<TextWithEntities> title) = 0;
 	virtual void setAdditionalTitle(Fn<QString()> additionalFactory) = 0;
 	virtual void setCloseByOutsideClick(bool close) = 0;
 
@@ -81,15 +81,9 @@ public:
 		getDelegate()->closeBox();
 	}
 
-	void setTitle(Fn<QString()> titleFactory) {
+	void setTitle(rpl::producer<QString> title);
-		if (titleFactory) {
+	void setTitle(rpl::producer<TextWithEntities> title) {
-			getDelegate()->setTitle([titleFactory] { return TextWithEntities { titleFactory(), EntitiesInText() }; });
+		getDelegate()->setTitle(std::move(title));
-		} else {
-			getDelegate()->setTitle(Fn<TextWithEntities()>());
-		}
-	}
-	void setTitle(Fn<TextWithEntities()> titleFactory) {
-		getDelegate()->setTitle(std::move(titleFactory));
 	}
 	void setAdditionalTitle(Fn<QString()> additional) {
 		getDelegate()->setAdditionalTitle(std::move(additional));
@@ -256,7 +250,7 @@ public:
 	void parentResized() override;
 
 	void setLayerType(bool layerType) override;
-	void setTitle(Fn<TextWithEntities()> titleFactory) override;
+	void setTitle(rpl::producer<TextWithEntities> title) override;
 	void setAdditionalTitle(Fn<QString()> additionalFactory) override;
 	void showBox(
 		object_ptr<BoxContent> box,
@@ -307,7 +301,6 @@ protected:
 private:
 	void paintAdditionalTitle(Painter &p);
 	void updateTitlePosition();
-	void refreshTitle();
 	void refreshAdditionalTitle();
 	void refreshLang();
 

Telegram/SourceFiles/boxes/add_contact_box.cpp

@@ -212,10 +212,13 @@ void AddContactBox::prepare() {
 		setTabOrder(_last, _first);
 	}
 	if (_user) {
-		setTitle(langFactory(lng_edit_contact_title));
+		setTitle(tr::lng_edit_contact_title());
 	} else {
-		auto readyToAdd = !_phone->getLastText().isEmpty() && (!_first->getLastText().isEmpty() || !_last->getLastText().isEmpty());
+		const auto readyToAdd = !_phone->getLastText().isEmpty()
-		setTitle(langFactory(readyToAdd ? lng_confirm_contact_data : lng_enter_contact_data));
+			&& (!_first->getLastText().isEmpty() || !_last->getLastText().isEmpty());
+		setTitle(readyToAdd
+			? tr::lng_confirm_contact_data()
+			: tr::lng_enter_contact_data());
 	}
 	updateButtons();
 
@@ -1092,7 +1095,7 @@ EditNameBox::EditNameBox(QWidget*, not_null<UserData*> user)
 void EditNameBox::prepare() {
 	auto newHeight = st::contactPadding.top() + _first->height();
 
-	setTitle(langFactory(lng_edit_self_title));
+	setTitle(tr::lng_edit_self_title());
 	newHeight += st::contactSkip + _last->height();
 
 	newHeight += st::boxPadding.bottom() + st::contactPadding.bottom();

Telegram/SourceFiles/boxes/auto_download_box.cpp

@@ -43,7 +43,7 @@ void AutoDownloadBox::setupContent() {
 	using namespace rpl::mappers;
 	using Type = Data::AutoDownload::Type;
 
-	setTitle(langFactory(lng_media_auto_title));
+	setTitle(tr::lng_media_auto_title());
 
 	const auto settings = &Auth().settings().autoDownload();
 	const auto checked = [=](Source source, Type type) {

Telegram/SourceFiles/boxes/auto_lock_box.cpp

@@ -14,7 +14,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "styles/style_boxes.h"
 
 void AutoLockBox::prepare() {
-	setTitle(langFactory(lng_passcode_autolock));
+	setTitle(tr::lng_passcode_autolock());
 
 	addButton(langFactory(lng_box_ok), [this] { closeBox(); });
 

Telegram/SourceFiles/boxes/background_box.cpp

@@ -122,7 +122,7 @@ BackgroundBox::BackgroundBox(QWidget*) {
 }
 
 void BackgroundBox::prepare() {
-	setTitle(langFactory(lng_backgrounds_header));
+	setTitle(tr::lng_backgrounds_header());
 
 	addButton(langFactory(lng_close), [=] { closeBox(); });
 

Telegram/SourceFiles/boxes/background_preview_box.cpp

@@ -407,7 +407,7 @@ not_null<HistoryView::ElementDelegate*> BackgroundPreviewBox::delegate() {
 }
 
 void BackgroundPreviewBox::prepare() {
-	setTitle(langFactory(lng_background_header));
+	setTitle(tr::lng_background_header());
 
 	addButton(langFactory(lng_background_apply), [=] { apply(); });
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });

Telegram/SourceFiles/boxes/change_phone_box.cpp

@@ -120,7 +120,7 @@ private:
 };
 
 void ChangePhoneBox::EnterPhone::prepare() {
-	setTitle(langFactory(lng_change_phone_title));
+	setTitle(tr::lng_change_phone_title());
 
 	auto phoneValue = QString();
 	_phone.create(this, st::defaultInputField, tr::lng_change_phone_new_title(), phoneValue);
@@ -235,7 +235,7 @@ ChangePhoneBox::EnterCode::EnterCode(QWidget*, const QString &phone, const QStri
 }
 
 void ChangePhoneBox::EnterCode::prepare() {
-	setTitle(langFactory(lng_change_phone_title));
+	setTitle(tr::lng_change_phone_title());
 
 	auto descriptionText = lng_change_phone_code_description__rich(
 		lt_phone,
@@ -338,7 +338,7 @@ bool ChangePhoneBox::EnterCode::sendCodeFail(const RPCError &error) {
 }
 
 void ChangePhoneBox::prepare() {
-	setTitle(langFactory(lng_change_phone_title));
+	setTitle(tr::lng_change_phone_title());
 	addButton(langFactory(lng_change_phone_button), [] {
 		Ui::show(Box<ConfirmBox>(lang(lng_change_phone_warning), [] {
 			Ui::show(Box<EnterPhone>());

Telegram/SourceFiles/boxes/confirm_phone_box.cpp

@@ -282,7 +282,7 @@ void ConfirmPhoneBox::prepare() {
 	_code->setAutoSubmit(_sentCodeLength, [=] { sendCode(); });
 	_code->setChangedCallback([=] { showError(QString()); });
 
-	setTitle(langFactory(lng_confirm_phone_title));
+	setTitle(tr::lng_confirm_phone_title());
 
 	addButton(langFactory(lng_confirm_phone_send), [=] { sendCode(); });
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });

Telegram/SourceFiles/boxes/connection_box.cpp

@@ -469,7 +469,7 @@ ProxiesBox::ProxiesBox(
 }
 
 void ProxiesBox::prepare() {
-	setTitle(langFactory(lng_proxy_settings));
+	setTitle(tr::lng_proxy_settings());
 
 	addButton(langFactory(lng_proxy_add), [=] { addNewProxy(); });
 	addButton(langFactory(lng_close), [=] { closeBox(); });
@@ -698,7 +698,7 @@ ProxyBox::ProxyBox(
 }
 
 void ProxyBox::prepare() {
-	setTitle(langFactory(lng_proxy_edit));
+	setTitle(tr::lng_proxy_edit());
 
 	refreshButtons();
 	setDimensionsToContent(st::boxWideWidth, _content);

Telegram/SourceFiles/boxes/create_poll_box.cpp

@@ -725,7 +725,7 @@ object_ptr<Ui::RpWidget> CreatePollBox::setupContent() {
 }
 
 void CreatePollBox::prepare() {
-	setTitle(langFactory(lng_polls_create_title));
+	setTitle(tr::lng_polls_create_title());
 
 	const auto inner = setInnerWidget(setupContent());
 

Telegram/SourceFiles/boxes/download_path_box.cpp

@@ -29,7 +29,7 @@ void DownloadPathBox::prepare() {
 	addButton(langFactory(lng_connection_save), [this] { save(); });
 	addButton(langFactory(lng_cancel), [this] { closeBox(); });
 
-	setTitle(langFactory(lng_download_path_header));
+	setTitle(tr::lng_download_path_header());
 
 	_group->setChangedCallback([this](Directory value) { radioChanged(value); });
 

Telegram/SourceFiles/boxes/edit_color_box.cpp

@@ -631,7 +631,7 @@ EditColorBox::EditColorBox(QWidget*, const QString &title, QColor current) : Box
 }
 
 void EditColorBox::prepare() {
-	setTitle([=] { return _title; });
+	setTitle(rpl::single(_title));
 
 	const auto hsvChanged = [=] { updateFromHSVFields(); };
 	const auto rgbChanged = [=] { updateFromRGBFields(); };

Telegram/SourceFiles/boxes/edit_privacy_box.cpp

@@ -32,7 +32,9 @@ namespace {
 
 class PrivacyExceptionsBoxController : public ChatsListBoxController {
 public:
-	PrivacyExceptionsBoxController(Fn<QString()> titleFactory, const std::vector<not_null<PeerData*>> &selected);
+	PrivacyExceptionsBoxController(
+		rpl::producer<QString> title,
+		const std::vector<not_null<PeerData*>> &selected);
 	void rowClicked(not_null<PeerListRow*> row) override;
 
 	std::vector<not_null<PeerData*>> getResult() const;
@@ -42,20 +44,20 @@ protected:
 	std::unique_ptr<Row> createRow(not_null<History*> history) override;
 
 private:
-	Fn<QString()> _titleFactory;
+	rpl::producer<QString> _title;
 	std::vector<not_null<PeerData*>> _selected;
 
 };
 
 PrivacyExceptionsBoxController::PrivacyExceptionsBoxController(
-	Fn<QString()> titleFactory,
+	rpl::producer<QString> title,
 	const std::vector<not_null<PeerData*>> &selected)
-: _titleFactory(std::move(titleFactory))
+: _title(std::move(title))
 , _selected(selected) {
 }
 
 void PrivacyExceptionsBoxController::prepareViewHook() {
-	delegate()->peerListSetTitle(_titleFactory);
+	delegate()->peerListSetTitle(std::move(_title));
 	delegate()->peerListAddSelectedRows(_selected);
 }
 
@@ -127,9 +129,7 @@ void EditPrivacyBox::editExceptions(
 		Exception exception,
 		Fn<void()> done) {
 	auto controller = std::make_unique<PrivacyExceptionsBoxController>(
-		crl::guard(this, [=] {
+		_controller->exceptionBoxTitle(exception),
-			return _controller->exceptionBoxTitle(exception);
-		}),
 		exceptions(exception));
 	auto initBox = [=, controller = controller.get()](
 			not_null<PeerListBox*> box) {
@@ -272,7 +272,7 @@ Ui::FlatLabel *EditPrivacyBox::addLabel(
 void EditPrivacyBox::setupContent() {
 	using namespace Settings;
 
-	setTitle([=] { return _controller->title(); });
+	setTitle(_controller->title());
 
 	auto wrap = object_ptr<Ui::VerticalLayout>(this);
 	const auto content = wrap.data();

Telegram/SourceFiles/boxes/edit_privacy_box.h

@@ -39,7 +39,7 @@ public:
 	[[nodiscard]] virtual Key key() = 0;
 	[[nodiscard]] virtual MTPInputPrivacyKey apiKey() = 0;
 
-	[[nodiscard]] virtual QString title() = 0;
+	[[nodiscard]] virtual rpl::producer<QString> title() = 0;
 	[[nodiscard]] virtual bool hasOption(Option option) {
 		return true;
 	}
@@ -50,7 +50,7 @@ public:
 	}
 	[[nodiscard]] virtual rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) = 0;
-	[[nodiscard]] virtual QString exceptionBoxTitle(
+	[[nodiscard]] virtual rpl::producer<QString> exceptionBoxTitle(
 		Exception exception) = 0;
 	[[nodiscard]] virtual auto exceptionsDescription()
 		-> rpl::producer<QString> = 0;

Telegram/SourceFiles/boxes/language_box.cpp

@@ -1037,7 +1037,7 @@ Ui::ScrollToRequest Content::jump(int rows) {
 void LanguageBox::prepare() {
 	addButton(langFactory(lng_box_ok), [=] { closeBox(); });
 
-	setTitle(langFactory(lng_languages));
+	setTitle(tr::lng_languages());
 
 	const auto select = createMultiSelect();
 

Telegram/SourceFiles/boxes/local_storage_box.cpp

@@ -297,7 +297,7 @@ void LocalStorageBox::Show(
 }
 
 void LocalStorageBox::prepare() {
-	setTitle(langFactory(lng_local_storage_title));
+	setTitle(tr::lng_local_storage_title());
 
 	addButton(langFactory(lng_box_ok), [this] { closeBox(); });
 

Telegram/SourceFiles/boxes/mute_settings_box.cpp

@@ -26,7 +26,7 @@ MuteSettingsBox::MuteSettingsBox(QWidget *parent, not_null<PeerData*> peer)
 }
 
 void MuteSettingsBox::prepare() {
-	setTitle(langFactory(lng_disable_notifications_from_tray));
+	setTitle(tr::lng_disable_notifications_from_tray());
 	auto y = 0;
 
 	object_ptr<Ui::FlatLabel> info(this, st::boxLabel);

Telegram/SourceFiles/boxes/passcode_box.cpp

@@ -108,20 +108,24 @@ void PasscodeBox::prepare() {
 	const auto onlyCheck = onlyCheckCurrent();
 	if (onlyCheck) {
 		_oldPasscode->show();
-		setTitle([=] {
+		setTitle(_cloudFields.customTitle
-			return _cloudFields.customTitle.value_or(lang(_cloudPwd
+			? rpl::single(*_cloudFields.customTitle)
-				? lng_cloud_password_remove
+			: _cloudPwd
-				: lng_passcode_remove));
+			? tr::lng_cloud_password_remove()
-		});
+			: tr::lng_passcode_remove());
 		setDimensions(st::boxWidth, st::passcodePadding.top() + _oldPasscode->height() + st::passcodeTextLine + ((_cloudFields.hasRecovery && !_hintText.isEmpty()) ? st::passcodeTextLine : 0) + st::passcodeAboutSkip + _aboutHeight + st::passcodePadding.bottom());
 	} else {
 		if (currentlyHave()) {
 			_oldPasscode->show();
-			setTitle(langFactory(_cloudPwd ? lng_cloud_password_change : lng_passcode_change));
+			setTitle(_cloudPwd
+				? tr::lng_cloud_password_change()
+				: tr::lng_passcode_change());
 			setDimensions(st::boxWidth, st::passcodePadding.top() + _oldPasscode->height() + st::passcodeTextLine + ((_cloudFields.hasRecovery && !_hintText.isEmpty()) ? st::passcodeTextLine : 0) + _newPasscode->height() + st::passcodeLittleSkip + _reenterPasscode->height() + st::passcodeSkip + (_cloudPwd ? _passwordHint->height() + st::passcodeLittleSkip : 0) + st::passcodeAboutSkip + _aboutHeight + st::passcodePadding.bottom());
 		} else {
 			_oldPasscode->hide();
-			setTitle(langFactory(_cloudPwd ? lng_cloud_password_create : lng_passcode_create));
+			setTitle(_cloudPwd
+				? tr::lng_cloud_password_create()
+				: tr::lng_passcode_create());
 			setDimensions(st::boxWidth, st::passcodePadding.top() + _newPasscode->height() + st::passcodeLittleSkip + _reenterPasscode->height() + st::passcodeSkip + (_cloudPwd ? _passwordHint->height() + st::passcodeLittleSkip : 0) + st::passcodeAboutSkip + _aboutHeight + (_cloudPwd ? (st::passcodeLittleSkip + _recoverEmail->height() + st::passcodeSkip) : st::passcodePadding.bottom()));
 		}
 	}
@@ -908,7 +912,7 @@ rpl::producer<> RecoverBox::recoveryExpired() const {
 }
 
 void RecoverBox::prepare() {
-	setTitle(langFactory(lng_signin_recover_title));
+	setTitle(tr::lng_signin_recover_title());
 
 	addButton(langFactory(lng_passcode_submit), [=] { submit(); });
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });

Telegram/SourceFiles/boxes/peer_list_box.h

@@ -225,7 +225,7 @@ struct PeerListState;
 
 class PeerListDelegate {
 public:
-	virtual void peerListSetTitle(Fn<QString()> title) = 0;
+	virtual void peerListSetTitle(rpl::producer<QString> title) = 0;
 	virtual void peerListSetAdditionalTitle(Fn<QString()> title) = 0;
 	virtual void peerListSetDescription(object_ptr<Ui::FlatLabel> description) = 0;
 	virtual void peerListSetSearchLoading(object_ptr<Ui::FlatLabel> loading) = 0;
@@ -755,7 +755,7 @@ public:
 		std::unique_ptr<PeerListController> controller,
 		Fn<void(not_null<PeerListBox*>)> init);
 
-	void peerListSetTitle(Fn<QString()> title) override {
+	void peerListSetTitle(rpl::producer<QString> title) override {
 		setTitle(std::move(title));
 	}
 	void peerListSetAdditionalTitle(

Telegram/SourceFiles/boxes/peer_list_controllers.cpp

@@ -325,7 +325,7 @@ ContactsBoxController::ContactsBoxController(
 void ContactsBoxController::prepare() {
 	setSearchNoResultsText(lang(lng_blocked_list_not_found));
 	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
-	delegate()->peerListSetTitle(langFactory(lng_contacts_header));
+	delegate()->peerListSetTitle(tr::lng_contacts_header());
 
 	prepareViewHook();
 
@@ -497,9 +497,9 @@ void AddBotToGroupBoxController::updateLabels() {
 }
 
 void AddBotToGroupBoxController::prepareViewHook() {
-	delegate()->peerListSetTitle(langFactory(sharingBotGame()
+	delegate()->peerListSetTitle(sharingBotGame()
-		? lng_bot_choose_chat
+		? tr::lng_bot_choose_chat()
-		: lng_bot_choose_group));
+		: tr::lng_bot_choose_group());
 	updateLabels();
 	Auth().data().chatsListLoadedEvents(
 	) | rpl::filter([=](Data::Folder *folder) {
@@ -515,7 +515,7 @@ ChooseRecipientBoxController::ChooseRecipientBoxController(
 }
 
 void ChooseRecipientBoxController::prepareViewHook() {
-	delegate()->peerListSetTitle(langFactory(lng_forward_choose));
+	delegate()->peerListSetTitle(tr::lng_forward_choose());
 }
 
 void ChooseRecipientBoxController::rowClicked(not_null<PeerListRow*> row) {

Telegram/SourceFiles/boxes/peers/add_participants_box.cpp

@@ -155,7 +155,7 @@ void AddParticipantsBoxController::updateTitle() {
 		&& !_peer->isMegagroup())
 		? QString() :
 		QString("%1 / %2").arg(fullCount()).arg(Global::MegagroupSizeMax());
-	delegate()->peerListSetTitle(langFactory(lng_profile_add_participant));
+	delegate()->peerListSetTitle(tr::lng_profile_add_participant());
 	delegate()->peerListSetAdditionalTitle([=] { return additional; });
 }
 
@@ -287,18 +287,18 @@ std::unique_ptr<PeerListRow> AddSpecialBoxController::createSearchRow(
 
 void AddSpecialBoxController::prepare() {
 	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
-	const auto title = [&] {
+	auto title = [&] {
 		switch (_role) {
 		case Role::Admins:
-			return langFactory(lng_channel_add_admin);
+			return tr::lng_channel_add_admin();
 		case Role::Restricted:
-			return langFactory(lng_channel_add_exception);
+			return tr::lng_channel_add_exception();
 		case Role::Kicked:
-			return langFactory(lng_channel_add_removed);
+			return tr::lng_channel_add_removed();
 		}
 		Unexpected("Role in AddSpecialBoxController::prepare()");
 	}();
-	delegate()->peerListSetTitle(title);
+	delegate()->peerListSetTitle(std::move(title));
 	setDescriptionText(lang(lng_contacts_loading));
 	setSearchNoResultsText(lang(lng_blocked_list_not_found));
 

Telegram/SourceFiles/boxes/peers/edit_contact_box.cpp

@@ -76,9 +76,9 @@ Controller::Controller(
 void Controller::prepare() {
 	setupContent();
 
-	_box->setTitle(langFactory(_user->isContact()
+	_box->setTitle(_user->isContact()
-		? lng_edit_contact_title
+		? tr::lng_edit_contact_title()
-		: lng_enter_contact_data));
+		: tr::lng_enter_contact_data());
 
 	_box->addButton(langFactory(lng_box_done), _save);
 	_box->addButton(langFactory(lng_cancel), [=] { _box->closeBox(); });

Telegram/SourceFiles/boxes/peers/edit_linked_chat_box.cpp

@@ -285,9 +285,9 @@ object_ptr<BoxContent> EditLinkedChatBox(
 			st::linkedChatAboutPadding);
 		box->peerListSetBelowWidget(std::move(below));
 
-		box->setTitle(langFactory(channel->isBroadcast()
+		box->setTitle(channel->isBroadcast()
-			? lng_manage_discussion_group
+			? tr::lng_manage_discussion_group()
-			: lng_manage_linked_channel));
+			: tr::lng_manage_linked_channel());
 		box->addButton(langFactory(lng_close), [=] { box->closeBox(); });
 	};
 	auto controller = std::make_unique<Controller>(

Telegram/SourceFiles/boxes/peers/edit_participant_box.cpp

@@ -69,7 +69,7 @@ void TransferPasswordError(
 		not_null<GenericBox*> box,
 		not_null<UserData*> user,
 		PasswordErrorType error) {
-	box->setTitle(langFactory(lng_rights_transfer_check));
+	box->setTitle(tr::lng_rights_transfer_check());
 	box->setWidth(st::transferCheckWidth);
 
 	auto text = lng_rights_transfer_check_about__rich(
@@ -271,9 +271,9 @@ void EditAdminBox::prepare() {
 	EditParticipantBox::prepare();
 
 	auto hadRights = _oldRights.c_chatAdminRights().vflags.v;
-	setTitle(langFactory(hadRights
+	setTitle(hadRights
-		? lng_rights_edit_admin
+		? tr::lng_rights_edit_admin()
-		: lng_channel_add_admin));
+		: tr::lng_channel_add_admin());
 
 	addControl(
 		object_ptr<BoxContentDivider>(this),
@@ -579,7 +579,7 @@ EditRestrictedBox::EditRestrictedBox(
 void EditRestrictedBox::prepare() {
 	EditParticipantBox::prepare();
 
-	setTitle(langFactory(lng_rights_user_restrictions));
+	setTitle(tr::lng_rights_user_restrictions());
 
 	addControl(
 		object_ptr<BoxContentDivider>(this),

Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp

@@ -1012,18 +1012,18 @@ rpl::producer<int> ParticipantsBoxController::onlineCountValue() const {
 }
 
 void ParticipantsBoxController::prepare() {
-	const auto titleKey = [&] {
+	auto title = [&] {
 		switch (_role) {
-		case Role::Admins: return lng_channel_admins;
+		case Role::Admins: return tr::lng_channel_admins();
 		case Role::Profile:
-		case Role::Members: return lng_profile_participants_section;
+		case Role::Members: return tr::lng_profile_participants_section();
-		case Role::Restricted: return lng_exceptions_list_title;
+		case Role::Restricted: return tr::lng_exceptions_list_title();
-		case Role::Kicked: return lng_removed_list_title;
+		case Role::Kicked: return tr::lng_removed_list_title();
 		}
 		Unexpected("Role in ParticipantsBoxController::prepare()");
 	}();
 	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
-	delegate()->peerListSetTitle(langFactory(titleKey));
+	delegate()->peerListSetTitle(std::move(title));
 	setDescriptionText(lang(lng_contacts_loading));
 	setSearchNoResultsText(lang(lng_blocked_list_not_found));
 

Telegram/SourceFiles/boxes/peers/edit_peer_history_visibility_box.cpp

@@ -111,7 +111,7 @@ EditPeerHistoryVisibilityBox::EditPeerHistoryVisibilityBox(
 void EditPeerHistoryVisibilityBox::prepare() {
 	_peer->updateFull();
 
-	setTitle(langFactory(lng_manage_history_visibility_title));
+	setTitle(tr::lng_manage_history_visibility_title());
 	addButton(langFactory(lng_settings_save), [=] {
 		auto local = std::move(_savedCallback);
 		local(_historyVisibility->value());

Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp

@@ -269,9 +269,9 @@ Controller::Controller(
 : _box(box)
 , _peer(peer)
 , _isGroup(_peer->isChat() || _peer->isMegagroup()) {
-	_box->setTitle(langFactory(_isGroup
+	_box->setTitle(_isGroup
-		? lng_edit_group
+		? tr::lng_edit_group()
-		: lng_edit_channel_title));
+		: tr::lng_edit_channel_title());
 	_box->addButton(langFactory(lng_settings_save), [this] {
 		save();
 	});

Telegram/SourceFiles/boxes/peers/edit_peer_permissions_box.cpp

@@ -298,7 +298,7 @@ auto EditPeerPermissionsBox::saveEvents() const
 }
 
 void EditPeerPermissionsBox::prepare() {
-	setTitle(langFactory(lng_manage_peer_permissions));
+	setTitle(tr::lng_manage_peer_permissions());
 
 	const auto inner = setInnerWidget(object_ptr<Ui::VerticalLayout>(this));
 

Telegram/SourceFiles/boxes/peers/edit_peer_type_box.cpp

@@ -58,12 +58,12 @@ public:
 	QString getUsernameInput();
 	void setFocusUsername();
 
-	LangKey getTitle() {
+	rpl::producer<QString> getTitle() {
 		return _isInviteLink
-			? lng_profile_invite_link_section
+			? tr::lng_profile_invite_link_section()
 			: _isGroup
-			? lng_manage_peer_group_type
+			? tr::lng_manage_peer_group_type()
-			: lng_manage_peer_channel_type;
+			: tr::lng_manage_peer_channel_type();
 	}
 
 	bool isInviteLink() {
@@ -730,7 +730,7 @@ void EditPeerTypeBox::prepare() {
 		lifetime());
 	controller->createContent();
 
-	setTitle(langFactory(controller->getTitle()));
+	setTitle(controller->getTitle());
 
 	if (!controller->isInviteLink() && _savedCallback.has_value()) {
 		addButton(langFactory(lng_settings_save), [=] {

Telegram/SourceFiles/boxes/rate_call_box.cpp

@@ -31,7 +31,7 @@ RateCallBox::RateCallBox(QWidget*, uint64 callId, uint64 callAccessHash)
 }
 
 void RateCallBox::prepare() {
-	setTitle(langFactory(lng_call_rate_label));
+	setTitle(tr::lng_call_rate_label());
 	addButton(langFactory(lng_cancel), [this] { closeBox(); });
 
 	for (auto i = 0; i < kMaxRating; ++i) {

Telegram/SourceFiles/boxes/report_box.cpp

@@ -34,17 +34,17 @@ ReportBox::ReportBox(QWidget*, not_null<PeerData*> peer, MessageIdsList ids)
 }
 
 void ReportBox::prepare() {
-	setTitle(langFactory([&] {
+	setTitle([&] {
 		if (_ids) {
-			return lng_report_message_title;
+			return tr::lng_report_message_title();
 		} else if (_peer->isUser()) {
-			return lng_report_bot_title;
+			return tr::lng_report_bot_title();
 		} else if (_peer->isMegagroup()) {
-			return lng_report_group_title;
+			return tr::lng_report_group_title();
 		} else {
-			return lng_report_title;
+			return tr::lng_report_title();
 		}
-	}()));
+	}());
 
 	addButton(langFactory(lng_report_button), [=] { report(); });
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });

Telegram/SourceFiles/boxes/self_destruction_box.cpp

@@ -86,7 +86,7 @@ QString SelfDestructionBox::DaysLabel(int days) {
 }
 
 void SelfDestructionBox::prepare() {
-	setTitle(langFactory(lng_self_destruct_title));
+	setTitle(tr::lng_self_destruct_title());
 
 	auto fake = object_ptr<Ui::FlatLabel>(
 		this,

Telegram/SourceFiles/boxes/sessions_box.cpp

@@ -80,7 +80,7 @@ SessionsBox::SessionsBox(QWidget*)
 }
 
 void SessionsBox::prepare() {
-	setTitle(langFactory(lng_sessions_other_header));
+	setTitle(tr::lng_sessions_other_header());
 
 	addButton(langFactory(lng_close), [=] { closeBox(); });
 

Telegram/SourceFiles/boxes/share_box.cpp

@@ -205,7 +205,7 @@ void ShareBox::prepare() {
 	_select->resizeToWidth(st::boxWideWidth);
 	Ui::SendPendingMoveResizeEvents(_select);
 
-	setTitle(langFactory(lng_share_title));
+	setTitle(tr::lng_share_title());
 
 	_inner = setInnerWidget(
 		object_ptr<Inner>(

Telegram/SourceFiles/boxes/single_choice_box.cpp

@@ -17,18 +17,18 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 SingleChoiceBox::SingleChoiceBox(
 	QWidget*,
-	LangKey title,
+	rpl::producer<QString> title,
 	const std::vector<QString> &optionTexts,
 	int initialSelection,
 	Fn<void(int)> callback)
-: _title(title)
+: _title(std::move(title))
 , _optionTexts(optionTexts)
 , _initialSelection(initialSelection)
 , _callback(callback) {
 }
 
 void SingleChoiceBox::prepare() {
-	setTitle(langFactory(_title));
+	setTitle(std::move(_title));
 
 	addButton(langFactory(lng_box_ok), [=] { closeBox(); });
 

Telegram/SourceFiles/boxes/single_choice_box.h

@@ -20,7 +20,7 @@ class SingleChoiceBox : public BoxContent {
 public:
 	SingleChoiceBox(
 		QWidget*,
-		LangKey title,
+		rpl::producer<QString> title,
 		const std::vector<QString> &optionTexts,
 		int initialSelection,
 		Fn<void(int)> callback);
@@ -29,7 +29,7 @@ protected:
 	void prepare() override;
 
 private:
-	LangKey _title;
+	rpl::producer<QString> _title;
 	std::vector<QString> _optionTexts;
 	int _initialSelection = 0;
 	Fn<void(int)> _callback;

Telegram/SourceFiles/boxes/sticker_set_box.cpp

@@ -18,6 +18,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/buttons.h"
 #include "ui/widgets/scroll_area.h"
 #include "ui/image/image.h"
+#include "ui/text/text_utilities.h"
 #include "ui/emoji_config.h"
 #include "auth_session.h"
 #include "apiwrap.h"
@@ -39,7 +40,7 @@ public:
 	bool loaded() const;
 	bool notInstalled() const;
 	bool official() const;
-	Fn<TextWithEntities()> title() const;
+	rpl::producer<TextWithEntities> title() const;
 	QString shortName() const;
 
 	void install();
@@ -113,7 +114,7 @@ void StickerSetBox::Show(DocumentData *document) {
 }
 
 void StickerSetBox::prepare() {
-	setTitle(langFactory(lng_contacts_loading));
+	setTitle(tr::lng_contacts_loading());
 
 	_inner = setInnerWidget(object_ptr<Inner>(this, _set), st::stickersScroll);
 	Auth().data().stickersUpdated(
@@ -519,18 +520,15 @@ bool StickerSetBox::Inner::official() const {
 	return _loaded && _setShortName.isEmpty();
 }
 
-Fn<TextWithEntities()> StickerSetBox::Inner::title() const {
+rpl::producer<TextWithEntities> StickerSetBox::Inner::title() const {
-	auto text = TextWithEntities { _setTitle };
+	if (!_loaded) {
-	if (_loaded) {
+		return tr::lng_contacts_loading() | Ui::Text::ToWithEntities();
-		if (_pack.isEmpty()) {
+	} else if (_pack.isEmpty()) {
-			return [] { return TextWithEntities { lang(lng_attach_failed), EntitiesInText() }; };
+		return tr::lng_attach_failed() | Ui::Text::ToWithEntities();
-		} else {
-			TextUtilities::ParseEntities(text, TextParseMentions);
-		}
-	} else {
-		return [] { return TextWithEntities { lang(lng_contacts_loading), EntitiesInText() }; };
 	}
-	return [text] { return text; };
+	auto text = TextWithEntities{ _setTitle };
+	TextUtilities::ParseEntities(text, TextParseMentions);
+	return rpl::single(text);
 }
 
 QString StickerSetBox::Inner::shortName() const {

Telegram/SourceFiles/boxes/stickers_box.cpp

@@ -255,12 +255,12 @@ void StickersBox::prepare() {
 		if (_tabs) {
 			Local::readArchivedStickers();
 		} else {
-			setTitle(langFactory(lng_stickers_group_set));
+			setTitle(tr::lng_stickers_group_set());
 		}
 	} else if (_section == Section::Archived) {
 		requestArchivedSets();
 	} else if (_section == Section::Attached) {
-		setTitle(langFactory(lng_stickers_attached_sets));
+		setTitle(tr::lng_stickers_attached_sets());
 	}
 	if (_tabs) {
 		if (Auth().data().archivedStickerSetsOrder().isEmpty()) {

Telegram/SourceFiles/boxes/username_box.cpp

@@ -42,7 +42,7 @@ void UsernameBox::prepare() {
 		? QString()
 		: lang(lng_username_available);
 
-	setTitle(langFactory(lng_username_title));
+	setTitle(tr::lng_username_title());
 
 	addButton(langFactory(lng_settings_save), [=] { save(); });
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });

Telegram/SourceFiles/calls/calls_box_controller.cpp

@@ -224,7 +224,7 @@ void BoxController::prepare() {
 		}
 	});
 
-	delegate()->peerListSetTitle(langFactory(lng_call_box_title));
+	delegate()->peerListSetTitle(tr::lng_call_box_title());
 	setDescriptionText(lang(lng_contacts_loading));
 	delegate()->peerListRefreshRows();
 

Telegram/SourceFiles/calls/calls_top_bar.cpp

@@ -48,7 +48,7 @@ DebugInfoBox::DebugInfoBox(QWidget*, base::weak_ptr<Call> call)
 }
 
 void DebugInfoBox::prepare() {
-	setTitle([] { return QString("Call Debug"); });
+	setTitle(rpl::single(qsl("Call Debug")));
 
 	addButton(langFactory(lng_close), [this] { closeBox(); });
 	_text = setInnerWidget(

Telegram/SourceFiles/chat_helpers/emoji_sets_manager.cpp

@@ -657,7 +657,7 @@ ManageSetsBox::ManageSetsBox(QWidget*) {
 void ManageSetsBox::prepare() {
 	const auto inner = setInnerWidget(object_ptr<Inner>(this));
 
-	setTitle(langFactory(lng_emoji_manage_sets));
+	setTitle(tr::lng_emoji_manage_sets());
 
 	addButton(langFactory(lng_close), [=] { closeBox(); });
 

Telegram/SourceFiles/chat_helpers/message_field.cpp

@@ -157,10 +157,9 @@ void EditLinkBox::prepare() {
 		}
 	});
 
-	const auto title = url->getLastText().isEmpty()
+	setTitle(url->getLastText().isEmpty()
-			? lng_formatting_link_create_title
+		? tr::lng_formatting_link_create_title()
-			: lng_formatting_link_edit_title;
+		: tr::lng_formatting_link_edit_title());
-	setTitle(langFactory(title));
 
 	addButton(langFactory(lng_formatting_link_create), submit);
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });

Telegram/SourceFiles/dialogs/dialogs_search_from_controllers.cpp

@@ -62,7 +62,7 @@ SearchFromController::SearchFromController(
 
 void SearchFromController::prepare() {
 	ParticipantsBoxController::prepare();
-	delegate()->peerListSetTitle(langFactory(lng_search_messages_from));
+	delegate()->peerListSetTitle(tr::lng_search_messages_from());
 }
 
 void SearchFromController::rowClicked(not_null<PeerListRow*> row) {

Telegram/SourceFiles/export/view/export_view_panel_controller.cpp

@@ -41,7 +41,7 @@ SuggestBox::SuggestBox(QWidget*) {
 }
 
 void SuggestBox::prepare() {
-	setTitle(langFactory(lng_export_suggest_title));
+	setTitle(tr::lng_export_suggest_title());
 
 	addButton(langFactory(lng_box_ok), [=] {
 		closeBox();

Telegram/SourceFiles/history/admin_log/history_admin_log_filter.cpp

@@ -384,7 +384,7 @@ FilterBox::FilterBox(QWidget*, not_null<ChannelData*> channel, const std::vector
 }
 
 void FilterBox::prepare() {
-	setTitle(langFactory(lng_admin_log_filter_title));
+	setTitle(tr::lng_admin_log_filter_title());
 
 	_inner = setInnerWidget(object_ptr<Inner>(this, _channel, _admins, _initialFilter, [this] { refreshButtons(); }));
 	_inner->resizeToWidth(st::boxWideWidth);

Telegram/SourceFiles/info/common_groups/info_common_groups_inner_widget.cpp

@@ -83,7 +83,7 @@ std::unique_ptr<PeerListRow> ListController::createRow(
 void ListController::prepare() {
 	setSearchNoResultsText(lang(lng_bot_groups_not_found));
 	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
-	delegate()->peerListSetTitle(langFactory(lng_profile_common_groups_section));
+	delegate()->peerListSetTitle(tr::lng_profile_common_groups_section());
 }
 
 void ListController::loadMoreRows() {
@@ -240,7 +240,7 @@ object_ptr<InnerWidget::ListWidget> InnerWidget::setupList(
 	return result;
 }
 
-void InnerWidget::peerListSetTitle(Fn<QString()> title) {
+void InnerWidget::peerListSetTitle(rpl::producer<QString> title) {
 }
 
 void InnerWidget::peerListSetAdditionalTitle(

Telegram/SourceFiles/info/common_groups/info_common_groups_inner_widget.h

@@ -48,7 +48,7 @@ private:
 	using ListWidget = PeerListContent;
 
 	// PeerListContentDelegate interface.
-	void peerListSetTitle(Fn<QString()> title) override;
+	void peerListSetTitle(rpl::producer<QString> title) override;
 	void peerListSetAdditionalTitle(
 		Fn<QString()> title) override;
 	bool peerListIsRowSelected(not_null<PeerData*> peer) override;

Telegram/SourceFiles/info/profile/info_profile_members.cpp

@@ -409,7 +409,7 @@ void Members::visibleTopBottomUpdated(
 	setChildVisibleTopBottom(_list, visibleTop, visibleBottom);
 }
 
-void Members::peerListSetTitle(Fn<QString()> title) {
+void Members::peerListSetTitle(rpl::producer<QString> title) {
 }
 
 void Members::peerListSetAdditionalTitle(

Telegram/SourceFiles/info/profile/info_profile_members.h

@@ -59,7 +59,7 @@ private:
 	using ListWidget = PeerListContent;
 
 	// PeerListContentDelegate interface.
-	void peerListSetTitle(Fn<QString()> title) override;
+	void peerListSetTitle(rpl::producer<QString> title) override;
 	void peerListSetAdditionalTitle(
 		Fn<QString()> title) override;
 	bool peerListIsRowSelected(not_null<PeerData*> peer) override;

Telegram/SourceFiles/lang/lang_cloud_manager.cpp

@@ -71,7 +71,7 @@ ConfirmSwitchBox::ConfirmSwitchBox(
 }
 
 void ConfirmSwitchBox::prepare() {
-	setTitle(langFactory(lng_language_switch_title));
+	setTitle(tr::lng_language_switch_title());
 
 	const auto text = (_official
 		? lng_language_switch_about_official__rich
@@ -113,7 +113,7 @@ NotReadyBox::NotReadyBox(
 }
 
 void NotReadyBox::prepare() {
-	setTitle(langFactory(lng_language_not_ready_title));
+	setTitle(tr::lng_language_not_ready_title());
 
 	const auto text = lng_language_not_ready_about__rich(
 		lt_lang_name,

Telegram/SourceFiles/passport/passport_panel_edit_contact.cpp

@@ -31,7 +31,7 @@ class VerifyBox : public BoxContent {
 public:
 	VerifyBox(
 		QWidget*,
-		const QString &title,
+		rpl::producer<QString> title,
 		const QString &text,
 		int codeLength,
 		Fn<void(QString code)> submit,
@@ -55,7 +55,7 @@ private:
 		rpl::producer<QString> error,
 		rpl::producer<QString> resent);
 
-	QString _title;
+	rpl::producer<QString> _title;
 	Fn<void()> _submit;
 	QPointer<SentCodeField> _code;
 	QPointer<Ui::VerticalLayout> _content;
@@ -64,7 +64,7 @@ private:
 
 VerifyBox::VerifyBox(
 	QWidget*,
-	const QString &title,
+	rpl::producer<QString> title,
 	const QString &text,
 	int codeLength,
 	Fn<void(QString code)> submit,
@@ -72,7 +72,7 @@ VerifyBox::VerifyBox(
 	rpl::producer<QString> call,
 	rpl::producer<QString> error,
 	rpl::producer<QString> resent)
-: _title(title) {
+: _title(std::move(title)) {
 	setupControls(
 		text,
 		codeLength,
@@ -185,7 +185,7 @@ void VerifyBox::setInnerFocus() {
 }
 
 void VerifyBox::prepare() {
-	setTitle([=] { return _title; });
+	setTitle(std::move(_title));
 
 	addButton(langFactory(lng_change_phone_new_submit), _submit);
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });
@@ -391,7 +391,7 @@ object_ptr<BoxContent> VerifyPhoneBox(
 		rpl::producer<QString> call,
 		rpl::producer<QString> error) {
 	return Box<VerifyBox>(
-		lang(lng_passport_phone_title),
+		tr::lng_passport_phone_title(),
 		lng_passport_confirm_phone(lt_phone, App::formatPhone(phone)),
 		codeLength,
 		submit,
@@ -409,7 +409,7 @@ object_ptr<BoxContent> VerifyEmailBox(
 		rpl::producer<QString> error,
 		rpl::producer<QString> resent) {
 	return Box<VerifyBox>(
-		lang(lng_passport_email_title),
+		tr::lng_passport_email_title(),
 		lng_passport_confirm_email(lt_email, email),
 		codeLength,
 		submit,

Telegram/SourceFiles/passport/passport_panel_edit_document.cpp

@@ -35,7 +35,7 @@ class RequestTypeBox : public BoxContent {
 public:
 	RequestTypeBox(
 		QWidget*,
-		const QString &title,
+		rpl::producer<QString> title,
 		const QString &about,
 		std::vector<QString> labels,
 		Fn<void(int index)> submit);
@@ -49,7 +49,7 @@ private:
 		std::vector<QString> labels,
 		Fn<void(int index)> submit);
 
-	QString _title;
+	rpl::producer<QString> _title;
 	Fn<void()> _submit;
 	int _height = 0;
 
@@ -79,16 +79,16 @@ private:
 
 RequestTypeBox::RequestTypeBox(
 	QWidget*,
-	const QString &title,
+	rpl::producer<QString> title,
 	const QString &about,
 	std::vector<QString> labels,
 	Fn<void(int index)> submit)
-: _title(title) {
+: _title(std::move(title)) {
 	setupControls(about, std::move(labels), submit);
 }
 
 void RequestTypeBox::prepare() {
-	setTitle([=] { return _title; });
+	setTitle(std::move(_title));
 	addButton(langFactory(lng_passport_upload_document), _submit);
 	addButton(langFactory(lng_cancel), [=] { closeBox(); });
 	setDimensions(st::boxWidth, _height);
@@ -680,7 +680,7 @@ object_ptr<BoxContent> RequestIdentityType(
 		Fn<void(int index)> submit,
 		std::vector<QString> labels) {
 	return Box<RequestTypeBox>(
-		lang(lng_passport_identity_title),
+		tr::lng_passport_identity_title(),
 		lang(lng_passport_identity_about),
 		std::move(labels),
 		submit);
@@ -690,7 +690,7 @@ object_ptr<BoxContent> RequestAddressType(
 		Fn<void(int index)> submit,
 		std::vector<QString> labels) {
 	return Box<RequestTypeBox>(
-		lang(lng_passport_address_title),
+		tr::lng_passport_address_title(),
 		lang(lng_passport_address_about),
 		std::move(labels),
 		submit);

Telegram/SourceFiles/rpl/producer.h

@@ -106,6 +106,10 @@ public:
 		return _implementation ? _implementation(consumer) : lifetime();
 	}
 
+	bool empty() const {
+		return !_implementation;
+	}
+
 private:
 	std::function<lifetime(const consumer_type<type_erased_handlers<Value, Error>> &)> _implementation;
 
@@ -439,7 +443,7 @@ public:
 	}
 
 	explicit operator bool() const {
-		return (this->_generator != nullptr);
+		return !this->_generator.empty();
 	}
 
 };

Telegram/SourceFiles/settings/settings_calls.cpp

@@ -131,7 +131,7 @@ void Calls::setupContent() {
 			}
 		});
 		Ui::show(Box<SingleChoiceBox>(
-			lng_settings_call_output_device,
+			tr::lng_settings_call_output_device(),
 			options,
 			currentOption,
 			save));
@@ -209,7 +209,7 @@ void Calls::setupContent() {
 			}
 		});
 		Ui::show(Box<SingleChoiceBox>(
-			lng_settings_call_input_device,
+			tr::lng_settings_call_input_device(),
 			options,
 			currentOption,
 			save));

Telegram/SourceFiles/settings/settings_privacy_controllers.cpp

@@ -66,7 +66,7 @@ private:
 };
 
 void BlockUserBoxController::prepareViewHook() {
-	delegate()->peerListSetTitle(langFactory(lng_blocked_list_add_title));
+	delegate()->peerListSetTitle(tr::lng_blocked_list_add_title());
 	subscribe(Notify::PeerUpdated(), Notify::PeerUpdatedHandler(Notify::PeerUpdate::Flag::UserIsBlocked, [this](const Notify::PeerUpdate &update) {
 		if (auto user = update.peer->asUser()) {
 			if (auto row = delegate()->peerListFindRow(user->id)) {
@@ -154,7 +154,7 @@ AdminLog::OwnedItem GenerateForwardedItem(
 } // namespace
 
 void BlockedBoxController::prepare() {
-	delegate()->peerListSetTitle(langFactory(lng_blocked_list_title));
+	delegate()->peerListSetTitle(tr::lng_blocked_list_title());
 	setDescriptionText(lang(lng_contacts_loading));
 	delegate()->peerListRefreshRows();
 
@@ -311,8 +311,8 @@ MTPInputPrivacyKey PhoneNumberPrivacyController::apiKey() {
 	return MTP_inputPrivacyKeyPhoneNumber();
 }
 
-QString PhoneNumberPrivacyController::title() {
+rpl::producer<QString> PhoneNumberPrivacyController::title() {
-	return lang(lng_edit_privacy_phone_number_title);
+	return tr::lng_edit_privacy_phone_number_title();
 }
 
 rpl::producer<QString> PhoneNumberPrivacyController::optionsTitleKey() {
@@ -334,10 +334,11 @@ rpl::producer<QString> PhoneNumberPrivacyController::exceptionButtonTextKey(
 	Unexpected("Invalid exception value.");
 }
 
-QString PhoneNumberPrivacyController::exceptionBoxTitle(Exception exception) {
+rpl::producer<QString> PhoneNumberPrivacyController::exceptionBoxTitle(
+		Exception exception) {
 	switch (exception) {
-	case Exception::Always: return lang(lng_edit_privacy_phone_number_always_title);
+	case Exception::Always: return tr::lng_edit_privacy_phone_number_always_title();
-	case Exception::Never: return lang(lng_edit_privacy_phone_number_never_title);
+	case Exception::Never: return tr::lng_edit_privacy_phone_number_never_title();
 	}
 	Unexpected("Invalid exception value.");
 }
@@ -354,8 +355,8 @@ MTPInputPrivacyKey LastSeenPrivacyController::apiKey() {
 	return MTP_inputPrivacyKeyStatusTimestamp();
 }
 
-QString LastSeenPrivacyController::title() {
+rpl::producer<QString> LastSeenPrivacyController::title() {
-	return lang(lng_edit_privacy_lastseen_title);
+	return tr::lng_edit_privacy_lastseen_title();
 }
 
 rpl::producer<QString> LastSeenPrivacyController::optionsTitleKey() {
@@ -377,10 +378,11 @@ rpl::producer<QString> LastSeenPrivacyController::exceptionButtonTextKey(
 	Unexpected("Invalid exception value.");
 }
 
-QString LastSeenPrivacyController::exceptionBoxTitle(Exception exception) {
+rpl::producer<QString> LastSeenPrivacyController::exceptionBoxTitle(
+		Exception exception) {
 	switch (exception) {
-	case Exception::Always: return lang(lng_edit_privacy_lastseen_always_title);
+	case Exception::Always: return tr::lng_edit_privacy_lastseen_always_title();
-	case Exception::Never: return lang(lng_edit_privacy_lastseen_never_title);
+	case Exception::Never: return tr::lng_edit_privacy_lastseen_never_title();
 	}
 	Unexpected("Invalid exception value.");
 }
@@ -419,8 +421,8 @@ MTPInputPrivacyKey GroupsInvitePrivacyController::apiKey() {
 	return MTP_inputPrivacyKeyChatInvite();
 }
 
-QString GroupsInvitePrivacyController::title() {
+rpl::producer<QString> GroupsInvitePrivacyController::title() {
-	return lang(lng_edit_privacy_groups_title);
+	return tr::lng_edit_privacy_groups_title();
 }
 
 bool GroupsInvitePrivacyController::hasOption(Option option) {
@@ -440,10 +442,11 @@ rpl::producer<QString> GroupsInvitePrivacyController::exceptionButtonTextKey(
 	Unexpected("Invalid exception value.");
 }
 
-QString GroupsInvitePrivacyController::exceptionBoxTitle(Exception exception) {
+rpl::producer<QString> GroupsInvitePrivacyController::exceptionBoxTitle(
+		Exception exception) {
 	switch (exception) {
-	case Exception::Always: return lang(lng_edit_privacy_groups_always_title);
+	case Exception::Always: return tr::lng_edit_privacy_groups_always_title();
-	case Exception::Never: return lang(lng_edit_privacy_groups_never_title);
+	case Exception::Never: return tr::lng_edit_privacy_groups_never_title();
 	}
 	Unexpected("Invalid exception value.");
 }
@@ -461,8 +464,8 @@ MTPInputPrivacyKey CallsPrivacyController::apiKey() {
 	return MTP_inputPrivacyKeyPhoneCall();
 }
 
-QString CallsPrivacyController::title() {
+rpl::producer<QString> CallsPrivacyController::title() {
-	return lang(lng_edit_privacy_calls_title);
+	return tr::lng_edit_privacy_calls_title();
 }
 
 rpl::producer<QString> CallsPrivacyController::optionsTitleKey() {
@@ -478,10 +481,11 @@ rpl::producer<QString> CallsPrivacyController::exceptionButtonTextKey(
 	Unexpected("Invalid exception value.");
 }
 
-QString CallsPrivacyController::exceptionBoxTitle(Exception exception) {
+rpl::producer<QString> CallsPrivacyController::exceptionBoxTitle(
+		Exception exception) {
 	switch (exception) {
-	case Exception::Always: return lang(lng_edit_privacy_calls_always_title);
+	case Exception::Always: return tr::lng_edit_privacy_calls_always_title();
-	case Exception::Never: return lang(lng_edit_privacy_calls_never_title);
+	case Exception::Never: return tr::lng_edit_privacy_calls_never_title();
 	}
 	Unexpected("Invalid exception value.");
 }
@@ -516,8 +520,8 @@ MTPInputPrivacyKey CallsPeer2PeerPrivacyController::apiKey() {
 	return MTP_inputPrivacyKeyPhoneP2P();
 }
 
-QString CallsPeer2PeerPrivacyController::title() {
+rpl::producer<QString> CallsPeer2PeerPrivacyController::title() {
-	return lang(lng_edit_privacy_calls_p2p_title);
+	return tr::lng_edit_privacy_calls_p2p_title();
 }
 
 rpl::producer<QString> CallsPeer2PeerPrivacyController::optionsTitleKey() {
@@ -547,10 +551,11 @@ rpl::producer<QString> CallsPeer2PeerPrivacyController::exceptionButtonTextKey(
 	Unexpected("Invalid exception value.");
 }
 
-QString CallsPeer2PeerPrivacyController::exceptionBoxTitle(Exception exception) {
+rpl::producer<QString> CallsPeer2PeerPrivacyController::exceptionBoxTitle(
+		Exception exception) {
 	switch (exception) {
-	case Exception::Always: return lang(lng_edit_privacy_calls_p2p_always_title);
+	case Exception::Always: return tr::lng_edit_privacy_calls_p2p_always_title();
-	case Exception::Never: return lang(lng_edit_privacy_calls_p2p_never_title);
+	case Exception::Never: return tr::lng_edit_privacy_calls_p2p_never_title();
 	}
 	Unexpected("Invalid exception value.");
 }
@@ -567,8 +572,8 @@ MTPInputPrivacyKey ForwardsPrivacyController::apiKey() {
 	return MTP_inputPrivacyKeyForwards();
 }
 
-QString ForwardsPrivacyController::title() {
+rpl::producer<QString> ForwardsPrivacyController::title() {
-	return lang(lng_edit_privacy_forwards_title);
+	return tr::lng_edit_privacy_forwards_title();
 }
 
 rpl::producer<QString> ForwardsPrivacyController::optionsTitleKey() {
@@ -588,10 +593,11 @@ rpl::producer<QString> ForwardsPrivacyController::exceptionButtonTextKey(
 	Unexpected("Invalid exception value.");
 }
 
-QString ForwardsPrivacyController::exceptionBoxTitle(Exception exception) {
+rpl::producer<QString> ForwardsPrivacyController::exceptionBoxTitle(
+		Exception exception) {
 	switch (exception) {
-	case Exception::Always: return lang(lng_edit_privacy_forwards_always_title);
+	case Exception::Always: return tr::lng_edit_privacy_forwards_always_title();
-	case Exception::Never: return lang(lng_edit_privacy_forwards_never_title);
+	case Exception::Never: return tr::lng_edit_privacy_forwards_never_title();
 	}
 	Unexpected("Invalid exception value.");
 }
@@ -759,8 +765,8 @@ MTPInputPrivacyKey ProfilePhotoPrivacyController::apiKey() {
 	return MTP_inputPrivacyKeyProfilePhoto();
 }
 
-QString ProfilePhotoPrivacyController::title() {
+rpl::producer<QString> ProfilePhotoPrivacyController::title() {
-	return lang(lng_edit_privacy_profile_photo_title);
+	return tr::lng_edit_privacy_profile_photo_title();
 }
 
 bool ProfilePhotoPrivacyController::hasOption(Option option) {
@@ -780,10 +786,11 @@ rpl::producer<QString> ProfilePhotoPrivacyController::exceptionButtonTextKey(
 	Unexpected("Invalid exception value.");
 }
 
-QString ProfilePhotoPrivacyController::exceptionBoxTitle(Exception exception) {
+rpl::producer<QString> ProfilePhotoPrivacyController::exceptionBoxTitle(
+		Exception exception) {
 	switch (exception) {
-	case Exception::Always: return lang(lng_edit_privacy_profile_photo_always_title);
+	case Exception::Always: return tr::lng_edit_privacy_profile_photo_always_title();
-	case Exception::Never: return lang(lng_edit_privacy_profile_photo_never_title);
+	case Exception::Never: return tr::lng_edit_privacy_profile_photo_never_title();
 	}
 	Unexpected("Invalid exception value.");
 }

Telegram/SourceFiles/settings/settings_privacy_controllers.h

@@ -45,12 +45,12 @@ public:
 	Key key() override;
 	MTPInputPrivacyKey apiKey() override;
 
-	QString title() override;
+	rpl::producer<QString> title() override;
 	rpl::producer<QString> optionsTitleKey() override;
 	rpl::producer<QString> warning() override;
 	rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) override;
-	QString exceptionBoxTitle(Exception exception) override;
+	rpl::producer<QString> exceptionBoxTitle(Exception exception) override;
 	rpl::producer<QString> exceptionsDescription() override;
 
 };
@@ -63,12 +63,12 @@ public:
 	Key key() override;
 	MTPInputPrivacyKey apiKey() override;
 
-	QString title() override;
+	rpl::producer<QString> title() override;
 	rpl::producer<QString> optionsTitleKey() override;
 	rpl::producer<QString> warning() override;
 	rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) override;
-	QString exceptionBoxTitle(Exception exception) override;
+	rpl::producer<QString> exceptionBoxTitle(Exception exception) override;
 	rpl::producer<QString> exceptionsDescription() override;
 
 	void confirmSave(
@@ -85,12 +85,12 @@ public:
 	Key key() override;
 	MTPInputPrivacyKey apiKey() override;
 
-	QString title() override;
+	rpl::producer<QString> title() override;
 	bool hasOption(Option option) override;
 	rpl::producer<QString> optionsTitleKey() override;
 	rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) override;
-	QString exceptionBoxTitle(Exception exception) override;
+	rpl::producer<QString> exceptionBoxTitle(Exception exception) override;
 	rpl::producer<QString> exceptionsDescription() override;
 
 };
@@ -103,11 +103,11 @@ public:
 	Key key() override;
 	MTPInputPrivacyKey apiKey() override;
 
-	QString title() override;
+	rpl::producer<QString> title() override;
 	rpl::producer<QString> optionsTitleKey() override;
 	rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) override;
-	QString exceptionBoxTitle(Exception exception) override;
+	rpl::producer<QString> exceptionBoxTitle(Exception exception) override;
 	rpl::producer<QString> exceptionsDescription() override;
 
 	object_ptr<Ui::RpWidget> setupBelowWidget(
@@ -123,13 +123,13 @@ public:
 	Key key() override;
 	MTPInputPrivacyKey apiKey() override;
 
-	QString title() override;
+	rpl::producer<QString> title() override;
 	rpl::producer<QString> optionsTitleKey() override;
 	LangKey optionLabelKey(EditPrivacyBox::Option option) override;
 	rpl::producer<QString> warning() override;
 	rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) override;
-	QString exceptionBoxTitle(Exception exception) override;
+	rpl::producer<QString> exceptionBoxTitle(Exception exception) override;
 	rpl::producer<QString> exceptionsDescription() override;
 
 };
@@ -144,12 +144,12 @@ public:
 	Key key() override;
 	MTPInputPrivacyKey apiKey() override;
 
-	QString title() override;
+	rpl::producer<QString> title() override;
 	rpl::producer<QString> optionsTitleKey() override;
 	rpl::producer<QString> warning() override;
 	rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) override;
-	QString exceptionBoxTitle(Exception exception) override;
+	rpl::producer<QString> exceptionBoxTitle(Exception exception) override;
 	rpl::producer<QString> exceptionsDescription() override;
 
 	object_ptr<Ui::RpWidget> setupAboveWidget(
@@ -176,12 +176,12 @@ public:
 	Key key() override;
 	MTPInputPrivacyKey apiKey() override;
 
-	QString title() override;
+	rpl::producer<QString> title() override;
 	bool hasOption(Option option) override;
 	rpl::producer<QString> optionsTitleKey() override;
 	rpl::producer<QString> exceptionButtonTextKey(
 		Exception exception) override;
-	QString exceptionBoxTitle(Exception exception) override;
+	rpl::producer<QString> exceptionBoxTitle(Exception exception) override;
 	rpl::producer<QString> exceptionsDescription() override;
 
 };

Telegram/SourceFiles/support/support_autocomplete.cpp

@@ -507,7 +507,7 @@ ConfirmContactBox::ConfirmContactBox(
 }
 
 void ConfirmContactBox::prepare() {
-	setTitle([] { return "Confirmation"; });
+	setTitle(rpl::single(qsl("Confirmation"))); // #TODO hard_lang
 
 	auto maxWidth = 0;
 	if (_comment) {

Telegram/SourceFiles/support/support_helper.cpp

@@ -73,7 +73,7 @@ EditInfoBox::EditInfoBox(
 }
 
 void EditInfoBox::prepare() {
-	setTitle([] { return QString("Edit support information"); }); // #TODO hard_lang
+	setTitle(rpl::single(qsl("Edit support information"))); // #TODO hard_lang
 
 	const auto save = [=] {
 		const auto done = crl::guard(this, [=](bool success) {

Telegram/SourceFiles/ui/countryinput.cpp

@@ -230,7 +230,7 @@ QString CountrySelectBox::ISOByPhone(const QString &phone) {
 }
 
 void CountrySelectBox::prepare() {
-	setTitle(langFactory(lng_country_select));
+	setTitle(tr::lng_country_select());
 
 	_select->resizeToWidth(st::boxWidth);
 	_select->setQueryChangedCallback([=](const QString &query) {

Telegram/SourceFiles/window/themes/window_theme_editor.cpp

@@ -568,7 +568,7 @@ ThemeExportBox::ThemeExportBox(QWidget*, const QByteArray &paletteContent, const
 }
 
 void ThemeExportBox::prepare() {
-	setTitle(langFactory(lng_theme_editor_background_image));
+	setTitle(tr::lng_theme_editor_background_image());
 
 	addButton(langFactory(lng_theme_editor_export), [this] { exportTheme(); });
 	addButton(langFactory(lng_cancel), [this] { closeBox(); });

Telegram/SourceFiles/window/window_lock_widgets.cpp

@@ -215,7 +215,7 @@ rpl::producer<> TermsBox::cancelClicks() const {
 }
 
 void TermsBox::prepare() {
-	setTitle(langFactory(lng_terms_header));
+	setTitle(tr::lng_terms_header());
 
 	auto check = std::make_unique<Ui::CheckView>(st::defaultCheck, false);
 	const auto ageCheck = check.get();

Telegram/SourceFiles/window/window_peer_menu.cpp

@@ -742,9 +742,9 @@ void PeerMenuBlockUserBox(
 
 	box->addSkip(st::boxLittleSkip);
 
-	box->setTitle([=] {
+	box->setTitle(tr::lng_blocked_list_confirm_title(
-		return lng_blocked_list_confirm_title(lt_name, name);
+		lt_name,
-	});
+		rpl::single(name)));
 
 	box->addButton(langFactory(lng_blocked_list_confirm_ok), [=] {
 		const auto reportChecked = report && report->checked();

Telegram/ThirdParty/qtlottie

@@ -1 +1 @@
-Subproject commit eeeb4edb2a087c3f8175dafafcad330864d3efc0
+Subproject commit a3fac9db920b167a5f91d678ee7968f100f6fe51