Added permalink feature to posts in the RHS

web/static/i18n/en.json

@@ -827,11 +827,13 @@
   "rename_channel.cancel": "Cancel",
   "rename_channel.save": "Save",
   "rhs_comment.comment": "Comment",
+  "rhs_comment.permalink": "Permalink",
   "rhs_comment.edit": "Edit",
   "rhs_comment.del": "Delete",
   "rhs_comment.retry": "Retry",
   "rhs_header.details": "Message Details",
   "rhs_root.direct": "Direct Message",
+  "rhs_root.permalink": "Permalink",
   "rhs_root.edit": "Edit",
   "rhs_root.del": "Delete",
   "search_bar.search": "Search",