From 6aa70d72e771c8fcc07fa7da61cf93d0c1564e4b Mon Sep 17 00:00:00 2001
From: Diego Sampaio <chinello@gmail.com>
Date: Mon, 3 Apr 2017 14:24:18 -0300
Subject: [PATCH] Fix not loading language subtags

Closes #4277
---
 client/startup/startup.js                              |  6 +++++-
 .../app/client/views/livechatWindow.js                 | 10 +++++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/client/startup/startup.js b/client/startup/startup.js
index 8ea9aee30c77..98d6669af1f7 100644
--- a/client/startup/startup.js
+++ b/client/startup/startup.js
@@ -44,6 +44,7 @@ Meteor.startup(function() {
 		return RocketChat.settings.get('Language') || defaultAppLanguage();
 	};
 
+	const availableLanguages = TAPi18n.getLanguages();
 	const loadedLanguages = [];
 
 	window.setLanguage = function(language) {
@@ -63,7 +64,10 @@ Meteor.startup(function() {
 			$('html').removeClass('rtl');
 		}
 
-		language = language.split('-').shift();
+		if (!availableLanguages[language]) {
+			language = language.split('-').shift();
+		}
+
 		TAPi18n.setLanguage(language);
 
 		language = language.toLowerCase();
diff --git a/packages/rocketchat-livechat/app/client/views/livechatWindow.js b/packages/rocketchat-livechat/app/client/views/livechatWindow.js
index e0fb802e971f..fcbe88f9587d 100644
--- a/packages/rocketchat-livechat/app/client/views/livechatWindow.js
+++ b/packages/rocketchat-livechat/app/client/views/livechatWindow.js
@@ -70,6 +70,8 @@ Template.livechatWindow.events({
 Template.livechatWindow.onCreated(function() {
 	Session.set({sound: true});
 
+	const availableLanguages = TAPi18n.getLanguages();
+
 	const defaultAppLanguage = () => {
 		let lng = window.navigator.userLanguage || window.navigator.language || 'en';
 		const regexp = /([a-z]{2}-)([a-z]{2})/;
@@ -118,7 +120,13 @@ Template.livechatWindow.onCreated(function() {
 				Livechat.agent = result.agentData;
 			}
 
-			TAPi18n.setLanguage((result.language || defaultAppLanguage()).split('-').shift());
+			let language = result.language || defaultAppLanguage();
+
+			if (!availableLanguages[language]) {
+				language = language.split('-').shift();
+			}
+
+			TAPi18n.setLanguage(language);
 
 			Triggers.setTriggers(result.triggers);
 			Triggers.init();