Improve announcement queries

Necessary for AlekSIS-App-Chronos!41 (merged)

aleksis/core/templates/core/announcements.html

@@ -11,13 +11,20 @@
             {% endblocktrans %}
           {% else %}
             {% blocktrans with from=announcement.valid_from|naturalday until=announcement.valid_until|naturalday %}
-              Valid for {{ from }} – {{ until }}
+              Valid from {{ from }} until {{ until }}
             {% endblocktrans %}
           {% endif %}
         </em>
       {% endif %}
 
       <i class="material-icons left">announcement</i>
+
+      {% if show_recipients and announcement.recipients %}
+        <p>
+          {{ announcement.recipients.all|join:", " }}:
+        </p>
+      {% endif %}
+
       <p>
         <strong>{{ announcement.title }}</strong> <br/>
         {{ announcement.description }}