if the group is closed, add the closing date

Author: deniak

templates/components/listings/groups/entry.html.twig

@@ -7,6 +7,7 @@
         </h2>
         {% block group_description %}
             {{ group.description|purify }}
+            {% if group.closed %}<p><em>Group closed on {{ w3c_date_format(group.closedDate)|raw }}</em></p>{% endif %}
         {% endblock %}
         {% block group_ecosystems %}
             {% if group.ecosystems is defined and group.ecosystems|length > 0 %}