add notice for approving posts with shift+o

app/assets/javascripts/posts.js

@@ -465,6 +465,7 @@
           var $post = $("#post_" + post_id);
           $post.data("flags", $post.data("flags").replace(/pending/, ""));
           $post.removeClass("post-status-pending");
+          Danbooru.notice("Approved post #" + post_id);
         }
       }
     });