PLT-1800 Load server side locale from the config.json (#3202)

* PLT-1800 Load server side locale from the config.json

* Add support for locales with country specifics

* Fix localization on served locale file as plain/text

* Remove github.com/cloudfoundry/jibber_jabber as vendor dependency

* Fix get locale on login_controller

webapp/root.jsx

@@ -53,6 +53,7 @@ const ActionTypes = Constants.ActionTypes;
 import AdminConsole from 'components/admin_console/admin_console.jsx';
 import SystemAnalytics from 'components/analytics/system_analytics.jsx';
 import ConfigurationSettings from 'components/admin_console/configuration_settings.jsx';
+import LocalizationSettings from 'components/admin_console/localization_settings.jsx';
 import UsersAndTeamsSettings from 'components/admin_console/users_and_teams_settings.jsx';
 import PrivacySettings from 'components/admin_console/privacy_settings.jsx';
 import LogSettings from 'components/admin_console/log_settings.jsx';
@@ -142,8 +143,8 @@ function preRenderSetup(callwhendone) {
     );
 
     function afterIntl() {
-        I18n.doAddLocaleData();
         $.when(d1).done(() => {
+            I18n.doAddLocaleData();
             callwhendone();
         });
     }
@@ -362,6 +363,10 @@ function renderRootComponent() {
                                 path='configuration'
                                 component={ConfigurationSettings}
                             />
+                            <Route
+                                path='localization'
+                                component={LocalizationSettings}
+                            />
                             <Route
                                 path='users_and_teams'
                                 component={UsersAndTeamsSettings}