As an editor, I want to be notified when the publication of a content fails
Update the Editing UI based on the server side validation
As an editor, I want to have a visual feedback when I click on save draft
Merged in master in https://github.com/ezsystems/PlatformUIBundle/commit/6b6ef993daee014a05213a74a140595ae3753f53
Tested and approved by QA for master.