[MM-14058] Add support for i18n (#2190)

* Add language files

* Add react-intl, mmjstool, setup for adding translations

* Translated main module

* Translations for renderer

* A few minor fixes

* More fixes

* Add CI, add missing menu translations, other cleanup

* Added setting to manually select the language of the app

* Force English for E2e

* Unit tests

* Fix mmjstool

* Move set language to before update menu

* PR feedback

src/main/notifications/index.test.js

@@ -8,6 +8,8 @@ import {Notification, shell} from 'electron';
 import {PLAY_SOUND} from 'common/communication';
 import {TAB_MESSAGING} from 'common/tabs/TabView';
 
+import {localizeMessage} from 'main/i18nManager';
+
 import WindowManager from '../windows/windowManager';
 
 import {displayMention, displayDownloadCompleted, currentNotifications} from './index';
@@ -58,6 +60,10 @@ jest.mock('../windows/windowManager', () => ({
     switchTab: jest.fn(),
 }));
 
+jest.mock('main/i18nManager', () => ({
+    localizeMessage: jest.fn(),
+}));
+
 describe('main/notifications', () => {
     describe('displayMention', () => {
         beforeEach(() => {
@@ -152,6 +158,7 @@ describe('main/notifications', () => {
 
     describe('displayDownloadCompleted', () => {
         it('should open file when clicked', () => {
+            localizeMessage.mockReturnValue('test_filename');
             displayDownloadCompleted(
                 'test_filename',
                 '/path/to/file',