Added new Notifications add-on

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@765942 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated POT for notifications

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@765944 b8457f37-d9ea-0310-8a92-e5e31aec5664