show submitter email on backoffice event list

src/backoffice/templates/includes/event_list_table_backoffice.html

@@ -7,6 +7,7 @@
         {% if not noduration %}<th>Duration</th>{% endif %}
         {% if not nopeople %}<th>People</th>{% endif %}
         {% if not noschedule %}<th>Scheduled</th>{% endif %}
+        {% if not noemail %}<th>Submitter Email</th>{% endif %}
         {% if not noactions %}<th>Actions</th>{% endif %}
      </tr>
     </thead>
@@ -46,6 +47,9 @@
         {% endif %}
       </td>
       {% endif %}
+      {% if not noemail %}
+      <td>{{ event.proposal.user.email }}</td>
+      {% endif %}
       {% if not noactions %}
       <td>
         <div class="btn-group-vertical">