Display serverside HTML notifications correctly
Display serverside HTML notifications correctly

refs #4964

- persistent notifcations from the server contain HTML and should be marked HTML safe

airycanon/Ghost-Admin,JohnONolan/Ghost-Admin,acburdine/Ghost-Admin,JohnONolan/Ghost-Admin,TryGhost/Ghost-Admin,TryGhost/Ghost-Admin,kevinansfield/Ghost-Admin,dbalders/Ghost-Admin,airycanon/Ghost-Admin,dbalders/Ghost-Admin,kevinansfield/Ghost-Admin,acburdine/Ghost-Admin