(feat) Configurable Web animation level

UI/PreferencesUI/UIxJSONPreferences.m

@@ -1,6 +1,6 @@
 /* UIxJSONPreferences.m - this file is part of SOGo
  *
- * Copyright (C) 2007-2016 Inverse inc.
+ * Copyright (C) 2007-2017 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
@@ -126,6 +126,9 @@ static SoProduct *preferencesProduct = nil;
       [[defaults source] removeObjectForKey: @"SOGoAlternateAvatar"];
     }
 
+  if (![[defaults source] objectForKey: @"SOGoAnimationMode"])
+    [[defaults source] setObject: [defaults animationMode]  forKey: @"SOGoAnimationMode"];
+
   //
   // Default Calendar preferences
   //