diff --git a/Telegram/Resources/scheme.tl b/Telegram/Resources/scheme.tl
index 7125ec24a..485fdc5fe 100644
--- a/Telegram/Resources/scheme.tl
+++ b/Telegram/Resources/scheme.tl
@@ -1039,6 +1039,9 @@ inputCheckPasswordSRP#d27ff082 srp_id:long A:bytes M1:bytes = InputCheckPassword
 secureRequiredType#829d99da flags:# native_names:flags.0?true selfie_required:flags.1?true translation_required:flags.2?true type:SecureValueType = SecureRequiredType;
 secureRequiredTypeOneOf#27477b4 types:Vector<SecureRequiredType> = SecureRequiredType;
 
+help.passportConfigNotModified#bfb9f457 = help.PassportConfig;
+help.passportConfig#a098d6af hash:int countries_langs:DataJSON = help.PassportConfig;
+
 ---functions---
 
 invokeAfterMsg#cb9f372d {X:Type} msg_id:long query:!X = X;
@@ -1263,6 +1266,7 @@ help.getProxyData#3d7758e1 = help.ProxyData;
 help.getTermsOfServiceUpdate#2ca51fd1 = help.TermsOfServiceUpdate;
 help.acceptTermsOfService#ee72f79a id:DataJSON = Bool;
 help.getDeepLinkInfo#3fedc75f path:string = help.DeepLinkInfo;
+help.getPassportConfig#c661ad08 hash:int = help.PassportConfig;
 
 channels.readHistory#cc104937 channel:InputChannel max_id:int = Bool;
 channels.deleteMessages#84c1fd4e channel:InputChannel id:Vector<int> = messages.AffectedMessages;
@@ -1322,9 +1326,9 @@ phone.discardCall#78d413a6 peer:InputPhoneCall duration:int reason:PhoneCallDisc
 phone.setCallRating#1c536a34 peer:InputPhoneCall rating:int comment:string = Updates;
 phone.saveCallDebug#277add7e peer:InputPhoneCall debug:DataJSON = Bool;
 
-langpack.getLangPack#9ab5c58e lang_code:string = LangPackDifference;
-langpack.getStrings#2e1ee318 lang_code:string keys:Vector<string> = Vector<LangPackString>;
+langpack.getLangPack#f2f2330a lang_pack:string lang_code:string = LangPackDifference;
+langpack.getStrings#efea3803 lang_pack:string lang_code:string keys:Vector<string> = Vector<LangPackString>;
 langpack.getDifference#b2e4d7d from_version:int = LangPackDifference;
-langpack.getLanguages#800fd57d = Vector<LangPackLanguage>;
+langpack.getLanguages#42c6978f lang_pack:string = Vector<LangPackLanguage>;
 
 // LAYER 85
diff --git a/Telegram/SourceFiles/intro/introwidget.cpp b/Telegram/SourceFiles/intro/introwidget.cpp
index d7a2b1d7d..ec099af23 100644
--- a/Telegram/SourceFiles/intro/introwidget.cpp
+++ b/Telegram/SourceFiles/intro/introwidget.cpp
@@ -136,6 +136,7 @@ void Widget::createLanguageLink() {
 		createLink(Lang::GetOriginalValue(lng_switch_to_this), defaultId);
 	} else if (!suggestedId.isEmpty() && suggestedId != currentId) {
 		request(MTPlangpack_GetStrings(
+			MTP_string(Lang::CloudLangPackName()),
 			MTP_string(suggestedId),
 			MTP_vector<MTPstring>(1, MTP_string("lng_switch_to_this"))
 		)).done([=](const MTPVector<MTPLangPackString> &result) {
diff --git a/Telegram/SourceFiles/lang/lang_cloud_manager.cpp b/Telegram/SourceFiles/lang/lang_cloud_manager.cpp
index 76321246d..09f1f7366 100644
--- a/Telegram/SourceFiles/lang/lang_cloud_manager.cpp
+++ b/Telegram/SourceFiles/lang/lang_cloud_manager.cpp
@@ -32,17 +32,22 @@ void CloudManager::requestLangPackDifference() {
 
 	auto version = _langpack.version();
 	if (version > 0) {
-		_langPackRequestId = request(MTPlangpack_GetDifference(MTP_int(version))).done([this](const MTPLangPackDifference &result) {
+		_langPackRequestId = request(MTPlangpack_GetDifference(
+			MTP_int(version)
+		)).done([=](const MTPLangPackDifference &result) {
 			_langPackRequestId = 0;
 			applyLangPackDifference(result);
-		}).fail([this](const RPCError &error) {
+		}).fail([=](const RPCError &error) {
 			_langPackRequestId = 0;
 		}).send();
 	} else {
-		_langPackRequestId = request(MTPlangpack_GetLangPack(MTP_string(_langpack.cloudLangCode()))).done([this](const MTPLangPackDifference &result) {
+		_langPackRequestId = request(MTPlangpack_GetLangPack(
+			MTP_string(CloudLangPackName()),
+			MTP_string(_langpack.cloudLangCode())
+		)).done([=](const MTPLangPackDifference &result) {
 			_langPackRequestId = 0;
 			applyLangPackDifference(result);
-		}).fail([this](const RPCError &error) {
+		}).fail([=](const RPCError &error) {
 			_langPackRequestId = 0;
 		}).send();
 	}
@@ -100,7 +105,9 @@ void CloudManager::applyLangPackDifference(const MTPLangPackDifference &differen
 }
 
 void CloudManager::requestLanguageList() {
-	_languagesRequestId = request(MTPlangpack_GetLanguages()).done([this](const MTPVector<MTPLangPackLanguage> &result) {
+	_languagesRequestId = request(MTPlangpack_GetLanguages(
+		MTP_string(CloudLangPackName())
+	)).done([=](const MTPVector<MTPLangPackLanguage> &result) {
 		auto languages = Languages();
 		for_const (auto &langData, result.v) {
 			Assert(langData.type() == mtpc_langPackLanguage);
@@ -112,7 +119,7 @@ void CloudManager::requestLanguageList() {
 			_languagesChanged.notify();
 		}
 		_languagesRequestId = 0;
-	}).fail([this](const RPCError &error) {
+	}).fail([=](const RPCError &error) {
 		_languagesRequestId = 0;
 	}).send();
 }
@@ -212,11 +219,17 @@ void CloudManager::switchToLanguage(QString id) {
 		keys.push_back(MTP_string("lng_sure_save_language"));
 		keys.push_back(MTP_string("lng_box_ok"));
 		keys.push_back(MTP_string("lng_cancel"));
-		_switchingToLanguageRequest = request(MTPlangpack_GetStrings(MTP_string(id), MTP_vector<MTPstring>(std::move(keys)))).done([this, id](const MTPVector<MTPLangPackString> &result) {
+		_switchingToLanguageRequest = request(MTPlangpack_GetStrings(
+			MTP_string(Lang::CloudLangPackName()),
+			MTP_string(id),
+			MTP_vector<MTPstring>(std::move(keys))
+		)).done([=](const MTPVector<MTPLangPackString> &result) {
 			auto values = Instance::ParseStrings(result);
 			auto getValue = [&values](LangKey key) {
 				auto it = values.find(key);
-				return (it == values.cend()) ? GetOriginalValue(key) : it->second;
+				return (it == values.cend())
+					? GetOriginalValue(key)
+					: it->second;
 			};
 			auto text = getValue(lng_sure_save_language);
 			auto save = getValue(lng_box_ok);
diff --git a/Telegram/SourceFiles/lang/lang_instance.cpp b/Telegram/SourceFiles/lang/lang_instance.cpp
index e5831490a..9297b472c 100644
--- a/Telegram/SourceFiles/lang/lang_instance.cpp
+++ b/Telegram/SourceFiles/lang/lang_instance.cpp
@@ -19,14 +19,19 @@ namespace Lang {
 namespace {
 
 constexpr auto kDefaultLanguage = str_const("en");
+constexpr auto kCloudLangPackName = str_const("tdesktop");
 constexpr auto kLangValuesLimit = 20000;
 
 class ValueParser {
 public:
-	ValueParser(const QByteArray &key, LangKey keyIndex, const QByteArray &value);
+	ValueParser(
+		const QByteArray &key,
+		LangKey keyIndex,
+		const QByteArray &value);
 
 	QString takeResult() {
 		Expects(!_failed);
+
 		return std::move(_result);
 	}
 
@@ -164,6 +169,10 @@ QString DefaultLanguageId() {
 	return str_const_toString(kDefaultLanguage);
 }
 
+QString CloudLangPackName() {
+	return str_const_toString(kCloudLangPackName);
+}
+
 void Instance::switchToId(const QString &id) {
 	reset();
 	_id = id;
@@ -228,6 +237,10 @@ QString Instance::cloudLangCode() const {
 	return id();
 }
 
+QString Instance::langPackName() const {
+	return isCustom() ? QString() : CloudLangPackName();
+}
+
 QByteArray Instance::serialize() const {
 	auto size = Serialize::stringSize(_id);
 	size += sizeof(qint32); // version
@@ -462,7 +475,9 @@ void Instance::applyValue(const QByteArray &key, const QByteArray &value) {
 void Instance::updatePluralRules() {
 	auto id = _id;
 	if (isCustom()) {
-		auto path = _customFilePathAbsolute.isEmpty() ? _customFilePathRelative : _customFilePathAbsolute;
+		auto path = _customFilePathAbsolute.isEmpty()
+			? _customFilePathRelative
+			: _customFilePathAbsolute;
 		auto name = QFileInfo(path).fileName();
 		if (auto match = qthelp::regex_match("_([a-z]{2,3})(_[A-Z]{2,3}|\\-[a-z]{2,3})?\\.", name)) {
 			id = match->captured(1);
diff --git a/Telegram/SourceFiles/lang/lang_instance.h b/Telegram/SourceFiles/lang/lang_instance.h
index ea630122b..586e1d9fc 100644
--- a/Telegram/SourceFiles/lang/lang_instance.h
+++ b/Telegram/SourceFiles/lang/lang_instance.h
@@ -32,6 +32,7 @@ inline QString ConvertLegacyLanguageId(const QString &languageId) {
 }
 
 QString DefaultLanguageId();
+QString CloudLangPackName();
 
 class Instance;
 Instance &Current();
@@ -53,12 +54,15 @@ public:
 
 	QString systemLangCode() const;
 	QString cloudLangCode() const;
+	QString langPackName() const;
 
 	QString id() const {
 		return _id;
 	}
 	bool isCustom() const {
-		return (_id == qstr("custom") || _id == qstr("TEST_X") || _id == qstr("TEST_0"));
+		return (_id == qstr("custom")
+			|| _id == qstr("TEST_X")
+			|| _id == qstr("TEST_0"));
 	}
 	int version() const {
 		return _version;
@@ -69,7 +73,8 @@ public:
 	void fillFromLegacy(int legacyId, const QString &legacyPath);
 
 	void applyDifference(const MTPDlangPackDifference &difference);
-	static std::map<LangKey, QString> ParseStrings(const MTPVector<MTPLangPackString> &strings);
+	static std::map<LangKey, QString> ParseStrings(
+		const MTPVector<MTPLangPackString> &strings);
 	base::Observable<void> &updated() {
 		return _updated;
 	}
@@ -77,11 +82,13 @@ public:
 	QString getValue(LangKey key) const {
 		Expects(key >= 0 && key < kLangKeysCount);
 		Expects(_values.size() == kLangKeysCount);
+
 		return _values[key];
 	}
 	bool isNonDefaultPlural(LangKey key) const {
 		Expects(key >= 0 && key < kLangKeysCount);
 		Expects(_nonDefaultSet.size() == kLangKeysCount);
+
 		return _nonDefaultSet[key]
 			|| _nonDefaultSet[key + 1]
 			|| _nonDefaultSet[key + 2]
@@ -95,11 +102,17 @@ private:
 	// It is called for all key-value pairs in string.
 	// ResetCallback takes one QByteArray: key.
 	template <typename SetCallback, typename ResetCallback>
-	static void HandleString(const MTPLangPackString &mtpString, SetCallback setCallback, ResetCallback resetCallback);
+	static void HandleString(
+		const MTPLangPackString &mtpString,
+		SetCallback setCallback,
+		ResetCallback resetCallback);
 
 	// Writes each key-value pair in the result container.
 	template <typename Result>
-	static LangKey ParseKeyValue(const QByteArray &key, const QByteArray &value, Result &result);
+	static LangKey ParseKeyValue(
+		const QByteArray &key,
+		const QByteArray &value,
+		Result &result);
 
 	void applyValue(const QByteArray &key, const QByteArray &value);
 	void resetValue(const QByteArray &key);
@@ -107,7 +120,10 @@ private:
 	void fillDefaults();
 	void fillFromCustomFile(const QString &filePath);
 	void loadFromContent(const QByteArray &content);
-	void loadFromCustomContent(const QString &absolutePath, const QString &relativePath, const QByteArray &content);
+	void loadFromCustomContent(
+		const QString &absolutePath,
+		const QString &relativePath,
+		const QByteArray &content);
 	void updatePluralRules();
 
 	QString _id;
diff --git a/Telegram/SourceFiles/mtproto/connection.cpp b/Telegram/SourceFiles/mtproto/connection.cpp
index b27cb877c..96284301a 100644
--- a/Telegram/SourceFiles/mtproto/connection.cpp
+++ b/Telegram/SourceFiles/mtproto/connection.cpp
@@ -817,7 +817,7 @@ void ConnectionPrivate::tryToSend() {
 		Assert(_connectionOptions != nullptr);
 		const auto systemLangCode = _connectionOptions->systemLangCode;
 		const auto cloudLangCode = _connectionOptions->cloudLangCode;
-		const auto langPack = "tdesktop";
+		const auto langPackName = _connectionOptions->langPackName;
 		const auto deviceModel = (_dcType == DcType::Cdn)
 			? "n/a"
 			: Messenger::Instance().launcher()->deviceModel();
@@ -845,7 +845,7 @@ void ConnectionPrivate::tryToSend() {
 			MTP_string(systemVersion),
 			MTP_string(appVersion),
 			MTP_string(systemLangCode),
-			MTP_string(langPack),
+			MTP_string(langPackName),
 			MTP_string(cloudLangCode),
 			clientProxyFields,
 			SecureRequest());
diff --git a/Telegram/SourceFiles/mtproto/mtp_instance.cpp b/Telegram/SourceFiles/mtproto/mtp_instance.cpp
index 3697280e6..adac1e111 100644
--- a/Telegram/SourceFiles/mtproto/mtp_instance.cpp
+++ b/Telegram/SourceFiles/mtproto/mtp_instance.cpp
@@ -1524,6 +1524,10 @@ QString Instance::cloudLangCode() const {
 	return Lang::Current().cloudLangCode();
 }
 
+QString Instance::langPackName() const {
+	return Lang::Current().langPackName();
+}
+
 void Instance::requestConfig() {
 	_private->requestConfig();
 }
diff --git a/Telegram/SourceFiles/mtproto/mtp_instance.h b/Telegram/SourceFiles/mtproto/mtp_instance.h
index be489553b..bc39e9d6e 100644
--- a/Telegram/SourceFiles/mtproto/mtp_instance.h
+++ b/Telegram/SourceFiles/mtproto/mtp_instance.h
@@ -53,6 +53,7 @@ public:
 	DcId mainDcId() const;
 	QString systemLangCode() const;
 	QString cloudLangCode() const;
+	QString langPackName() const;
 
 	void setKeyForWrite(DcId dcId, const AuthKeyPtr &key);
 	AuthKeysList getKeysForWrite() const;
diff --git a/Telegram/SourceFiles/mtproto/session.cpp b/Telegram/SourceFiles/mtproto/session.cpp
index c0bec07af..b055c382f 100644
--- a/Telegram/SourceFiles/mtproto/session.cpp
+++ b/Telegram/SourceFiles/mtproto/session.cpp
@@ -30,6 +30,7 @@ QString LogIds(const QVector<uint64> &ids) {
 ConnectionOptions::ConnectionOptions(
 	const QString &systemLangCode,
 	const QString &cloudLangCode,
+	const QString &langPackName,
 	const ProxyData &proxy,
 	bool useIPv4,
 	bool useIPv6,
@@ -37,6 +38,7 @@ ConnectionOptions::ConnectionOptions(
 	bool useTcp)
 : systemLangCode(systemLangCode)
 , cloudLangCode(cloudLangCode)
+, langPackName(langPackName)
 , proxy(proxy)
 , useIPv4(useIPv4)
 , useIPv6(useIPv6)
@@ -63,6 +65,7 @@ void SessionData::notifyConnectionInited(const ConnectionOptions &options) {
 	QWriteLocker locker(&_lock);
 	if (options.cloudLangCode == _options.cloudLangCode
 		&& options.systemLangCode == _options.systemLangCode
+		&& options.langPackName == _options.langPackName
 		&& options.proxy == _options.proxy
 		&& !_options.inited) {
 		_options.inited = true;
@@ -178,6 +181,7 @@ void Session::refreshOptions() {
 	data.applyConnectionOptions(ConnectionOptions(
 		_instance->systemLangCode(),
 		_instance->cloudLangCode(),
+		_instance->langPackName(),
 		Global::UseProxy() ? proxy : ProxyData(),
 		useIPv4,
 		useIPv6,
diff --git a/Telegram/SourceFiles/mtproto/session.h b/Telegram/SourceFiles/mtproto/session.h
index ce4dbb0c2..da27be0d8 100644
--- a/Telegram/SourceFiles/mtproto/session.h
+++ b/Telegram/SourceFiles/mtproto/session.h
@@ -108,6 +108,7 @@ struct ConnectionOptions {
 	ConnectionOptions(
 		const QString &systemLangCode,
 		const QString &cloudLangCode,
+		const QString &langPackName,
 		const ProxyData &proxy,
 		bool useIPv4,
 		bool useIPv6,
@@ -118,6 +119,7 @@ struct ConnectionOptions {
 
 	QString systemLangCode;
 	QString cloudLangCode;
+	QString langPackName;
 	ProxyData proxy;
 	bool useIPv4 = true;
 	bool useIPv6 = true;