<mt:setvarblock name="system_msg" append="1">
    <mt:if name="request.saved_deleted">
        <mtapp:statusmsg
            id="saved-deleted"
            class="success">
            <__trans phrase="You have successfully deleted the asset(s).">
        </mtapp:statusmsg>
    </mt:if>
    <mt:if name="request.ext_from">
        <mt:if name="request.ext_to">
            <mtapp:statusmsg
                id="extension-changed"
                class="success">
                <__trans phrase="Extension changed from [_1] to [_2]" params="<mt:var name="request.ext_from" escape="html">%%<mt:var name="request.ext_to" escape="html">">
            </mtapp:statusmsg>
        </mt:if>
    </mt:if>
</mt:setvarblock>