<mt:setvarblock name="system_msg" append="1">
<div id="msg-block">
<mt:if name="request.saved">
  <mtapp:statusmsg
     id="saved-msg"
     class="success">
    <__trans phrase="Your changes have been saved.">
  </mtapp:statusmsg>
</mt:if>
</div>
</mt:setvarblock>
