[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/app/app.test.js

@@ -33,6 +33,9 @@ jest.mock('main/certificateStore', () => ({
     add: jest.fn(),
     save: jest.fn(),
 }));
+jest.mock('main/i18nManager', () => ({
+    localizeMessage: jest.fn(),
+}));
 jest.mock('main/tray/tray', () => ({}));
 jest.mock('main/windows/windowManager', () => ({
     getMainWindow: jest.fn(),