{% for message in app.flashes('notification') %}
    <div class="alert alert-{% if 'erreur' in message|lower %}danger{% else %}success{% endif %} alert-dismissible fade show">
        {{ message }}
        <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
    </div>
{% endfor %}