add icon

lib/views/widget/forbidden_content.html

@@ -21,7 +21,7 @@
   <div class="row row-alerts">
     <div class="col-xs-12">
         <p class="alert alert-inverse alert-grant">
-          Browsing of this page is restricted
+          <i class="icon-fw icon-lock" aria-hidden="true"></i> Browsing of this page is restricted
         </p>
     </div>
   </div>