special case the first upload through this page (beta)

different text for first upload to subsequent uploads
remove the explanation placeholder text on a succesful upload

changes:
* this makes options.successMessage optional
* turn gallery into a view to keep juliusz happy

Change-Id: I7ed2b55b8c364d917b2b68964299a3c714b3bc69
Merge "special case the first upload through this page (beta)"