Improved testablility

cps/templates/email_edit.html

@@ -89,7 +89,7 @@
       <div class="modal-body text-center">
         <p>{{_('Do you really want to delete this domain rule?')}}</p>
         <button type="button" class="btn btn-danger" id="btndeletedomain" >{{_('Delete')}}</button>
-        <button type="button" class="btn btn-default" data-dismiss="modal">{{_('Back')}}</button>
+        <button type="button" class="btn btn-default" id="btncancel" data-dismiss="modal">{{_('Back')}}</button>
       </div>
     </div>
   </div>