ELECTRON-519: support Japanese localization for menus, dialogs and windows (#401)

- add basic localisation implementation for menu items
- add more strings to support localisation on menus
- add more strings to support localisation on menus
- add all menu items for localisation
- refactor i18n code
- Add localization for screen picker, basic auth and notification settings child windows
- Add localization bridge
- add i18n support to more strings
- update translations
- add events to change language and redo menu template
- move config update logic to windowMgr
- fix linting issues and refactor
- add snipping tool messages

js/preload/preloadMain.js

@@ -303,6 +303,18 @@ function createAPI() {
          */
         setIsInMeeting: function (isInMeeting) {
             throttledSetIsInMeetingStatus(isInMeeting);
+        },
+
+        /**
+         * Sets the language which updates the application locale
+         * @param {string} locale - language identifier and a region identifier
+         * Ex: en-US, ja-JP
+         */
+        setLocale: function (locale) {
+            local.ipcRenderer.send(apiName, {
+                cmd: apiCmds.setLocale,
+                locale,
+            });
         }
     };