Add support for events with recurrence dates

UI/Scheduler/UIxCalMainView.m

@@ -1,6 +1,6 @@
 /* UIxCalMainView.m - this file is part of SOGo
  *
- * Copyright (C) 2006-2016 Inverse inc.
+ * Copyright (C) 2006-2017 Inverse inc.
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -476,6 +476,7 @@
                              @"weekly",
                              @"monthly",
                              @"yearly",
+                             @"custom",
                              nil];
       [repeatItems retain];
     }