Fix call to undefined method getBirthday()

Call to undefined method Modules\Teams\Mappers\Joins::getBirthday() in
application\modules\teams\views\admin\applications\show.php on line 54

http://www.ilch.de/forum-showposts-53826.html#389482

application/modules/teams/views/admin/applications/show.php

@@ -51,7 +51,7 @@
                     <?=$this->getTrans('birthday') ?>:
                 </label>
                 <div class="col-lg-2">
-                    <?=$birthday->format('d.m.Y') ?> (<?=$joinsMapper->getBirthday($birthday) ?>)
+                    <?=$birthday->format('d.m.Y') ?> (<?=$joinsMapper->getAge($birthday) ?>)
                 </div>
             </div>
         <?php endif; ?>