Add loading state to notification menu.

Summary: Notification menu shows a loading message before the menu is populated with the actual response.

Test Plan: Checked by having the function sleep between getting the response and populating the menu.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4696

src/view/page/menu/PhabricatorMainMenuView.php

@@ -390,6 +390,7 @@ final class PhabricatorMainMenuView extends AphrontView {
         'bubbleID'    => $bubble_id,
         'countID'     => $count_id,
         'dropdownID'  => $dropdown_id,
+        'loadingText' => pht('Loading...'),
       ));
 
     $notification_dropdown = javelin_render_tag(