wallabag/app/views/_alerts.twig

{% spaceless %}
{% set alertTypeAvaillable = [ 'info', 'success', 'warning', 'error'] %}
{% if app.session.flashBag is defined %}
    {%- for alertType in alertTypeAvaillable %}
        {%- for alert in app.session.flashBag.get(alertType) %}
                    <div class="alert alert-{{ alertType }}" >
                        {% if alert.title %}<h4 class="alert-heading">{{ alert.title|trans }}</h4>{% endif %}
                        {{ alert.message|trans|raw }}
                    </div>
        {%- endfor %}
    {%- endfor %}
{% endif %}
{% endspaceless %}