Issue 4580 - Replace ext.i18n with i18n

lib/utils.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
 let Utils = exports.Utils = {
   systemPrincipal: null,
   getString(id)
   {
-    return ext.i18n.getMessage("global_" + id);
+    return chrome.i18n.getMessage("global_" + id);
   },
   runAsync(callback)
   {
     if (document.readyState == "loading")
     {
       // Make sure to not run asynchronous actions before all
       // scripts loaded. This caused issues on Opera in the past.
       let onDOMContentLoaded = () =>
       {
         document.removeEventListener("DOMContentLoaded", onDOMContentLoaded);
         callback();
       };
       document.addEventListener("DOMContentLoaded", onDOMContentLoaded);
     }
     else
     {
       setTimeout(callback, 0);
     }
   },
   get appLocale()
   {
-    let locale = ext.i18n.getUILanguage();
+    let locale = chrome.i18n.getUILanguage();
     Object.defineProperty(this, "appLocale", {value: locale, enumerable: true});
     return this.appLocale;
   },
   get readingDirection()
   {
-    let direction = ext.i18n.getMessage("@@bidi_dir");
+    let direction = chrome.i18n.getMessage("@@bidi_dir");
     // This fallback is only necessary for Microsoft Edge
     if (!direction)
       direction = /^(?:ar|fa|he|ug|ur)\b/.test(this.appLocale) ? "rtl" : "ltr";
     Object.defineProperty(
       this,
       "readingDirection",
       {value: direction, enumerable: true}
     );
     return this.readingDirection;
   },
   generateChecksum(lines)
   {
     // We cannot calculate MD5 checksums yet :-(
     return null;
   },
 
   getDocLink(linkID)
   {
     let docLink = require("prefs").Prefs.documentation_link;
     return docLink.replace(/%LINK%/g, linkID)
                   .replace(/%LANG%/g, Utils.appLocale);
   },
 
   yield()
   {
   }
 };