fix table head

angular_app/event-info.html

@@ -49,9 +49,9 @@
                                 <tr>
                                     <th>{{'Person' | translate}}</th>
                                     <th>{{'Attended' | translate}}</th>
-                                    <td ng-repeat="col in customFields">
+                                    <th ng-repeat="col in customFields">
                                         <strong>{{col.label | translate}}</strong>
-                                    </td>
+                                    </th>
                                     <th>{{'Delete' | translate}}</th>
                                 </tr>
                             </thead>