Add i18n for "Hidden"

isso/js/app/i18n/en.js

@@ -17,6 +17,7 @@ define({
     "comment-deleted": "Comment deleted.",
     "comment-queued": "Comment in queue for moderation.",
     "comment-anonymous": "Anonymous",
+    "comment-hidden": "Hidden",
 
     "date-now": "right now",
     "date-minute": "a minute ago\n{{ n }} minutes ago",

isso/js/app/text/comment-loader.html

@@ -1,3 +1,3 @@
 <div class="isso-comment-loader" id="isso-loader-{{ name | blank }}">
-    <a class="load_hidden" href="#">{{ hidden_replies }} hidden</a>
+    <a class="load_hidden" href="#">{{ hidden_replies }} {{ i18n-comment-hidden }}</a>
 </div>