Adding a rough-cut owner editor

--HG--
extra : convert_revision : svn%3A5ff7c347-ad56-4c35-b696-ccb81de16e03/trunk%4043456

src/Orchard.Web/Core/Settings/Controllers/AdminController.cs

@@ -49,6 +49,10 @@ namespace Orchard.Core.Settings.Controllers {
             return TryUpdateModel(model, prefix, includeProperties, excludeProperties);
         }
 
+        void IUpdateModel.AddModelError(string key, LocalizedString errorMessage) {
+            ModelState.AddModelError(key, errorMessage.ToString());
+        }
+
         #endregion
     }
 }