BackofficeBundle/Resources/public/template/FlashMessage/flashMessage._tpl.html
<% _.each(flashMessages, function(messages, key) { %>
<div class="alert alert-<%- messages.getType() %> alert-dismissible">
<button type="button" class="close" data-dismiss="alert">×</button>
<%- messages.getMessage() %>
</div>
<% }); %>