window-list: Init translations

Whoops, we are missing the bindtextdomain() call, which means translations
won't work when no other extension that shares the same domain is used
(like in GNOME Classic for instance).

https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/issues/340

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/174>

extensions/window-list/extension.js

@@ -1105,6 +1105,8 @@ class WindowList extends St.Widget {
 
 class Extension {
     constructor() {
+        ExtensionUtils.initTranslations();
+
         this._windowLists = null;
         this._hideOverviewOrig = Main.overview.hide;
     }