{% with infos=cards|objects:"imio-atal-salles-a-louer-informations"|filter_by:"id_salle"|filter_value:salle_id|first %}
  <p>{{ infos|get:"informations"|safe }}</p>
  {% for photo in infos|get:"photos"|getlist:"fichier_url" %}
    <p><img alt="" src="{{ photo }}" /></p>
  {% endfor %}
{% endwith %}