Add i18n support to the main world

The main world didn't have access to the chrome.i18n API. This CL adds
support to access the API from the main world by using a bridge between
the main world and a server running in a content script.

Bug: twpowertools:157

Change-Id: I5b93f92156e9f658428214252c209570337c23a4
diff --git a/src/contentScripts/communityConsole/start.js b/src/contentScripts/communityConsole/start.js
index f364626..7abbeaa 100644
--- a/src/contentScripts/communityConsole/start.js
+++ b/src/contentScripts/communityConsole/start.js
@@ -1,4 +1,5 @@
 import {injectScript, injectStylesheet} from '../../common/contentScriptsUtils.js';
+import MWI18nServer from '../../common/mainWorldI18n/Server.js';
 import MWOptionsWatcherServer from '../../common/mainWorldOptionsWatcher/Server.js';
 import {getOptions} from '../../common/optionsUtils.js';
 import {kCSTarget, kMWTarget} from '../../xhrInterceptor/responseModifiers/index.js';
@@ -78,4 +79,5 @@
   }
 
   new MWOptionsWatcherServer(kCSTarget, kMWTarget);
+  new MWI18nServer();
 });