Rhbz1006063 message

Implement notification bar on top of the editor for - Warning and Error.
Fix comments in:
https://bugzilla.redhat.com/show_bug.cgi?id=1006063#c11 - return to editor doesn't open up editor view
https://bugzilla.redhat.com/show_bug.cgi?id=1006063#c12 - change of wording