PLT-6518 Fixed user's locale not being loaded with redux actions (#6359)

* Stopped ManageLanguages component from mutating user

* Removed obsolete reference to mm_user

* PLT-6518 Fixed user's locale not being loaded with redux actions

webapp/actions/global_actions.jsx

@@ -379,7 +379,7 @@ export function newLocalizationSelected(locale) {
             translations: en
         });
     } else {
-        const localeInfo = I18n.getLanguageInfo(locale) || I18n.getLanguageInfo(global.window.mm_config.DefaultClientLocale);
+        const localeInfo = I18n.getLanguageInfo(locale);
 
         Client.getTranslations(
             localeInfo.url,
@@ -401,13 +401,23 @@ export function newLocalizationSelected(locale) {
     }
 }
 
+export function loadCurrentLocale() {
+    const user = UserStore.getCurrentUser();
+
+    if (user && user.locale) {
+        newLocalizationSelected(user.locale);
+    } else {
+        loadDefaultLocale();
+    }
+}
+
 export function loadDefaultLocale() {
-    const defaultLocale = global.window.mm_config.DefaultClientLocale;
-    let locale = global.window.mm_user ? global.window.mm_user.locale || defaultLocale : defaultLocale;
+    let locale = global.window.mm_config.DefaultClientLocale;
 
     if (!I18n.getLanguageInfo(locale)) {
         locale = 'en';
     }
+
     return newLocalizationSelected(locale);
 }
 

webapp/actions/user_actions.jsx

@@ -9,6 +9,7 @@ import UserStore from 'stores/user_store.jsx';
 import ChannelStore from 'stores/channel_store.jsx';
 
 import {getChannelMembersForUserIds} from 'actions/channel_actions.jsx';
+import {loadCurrentLocale} from 'actions/global_actions.jsx';
 import {loadStatusesForProfilesList, loadStatusesForProfilesMap} from 'actions/status_actions.jsx';
 
 import {getDirectChannelName, getUserIdFromChannelName} from 'utils/utils.jsx';
@@ -51,6 +52,8 @@ import {getTeamMembersByIds, getMyTeamMembers} from 'mattermost-redux/actions/te
 export function loadMe(callback) {
     loadMeRedux()(dispatch, getState).then(
         () => {
+            loadCurrentLocale();
+
             if (callback) {
                 callback();
             }