Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

The previous behavior was a "disabled" link, which was still clickable
and linked to the edit file action.

If the 	user accesses a path like "/edit/master/README" show the file
edit form (just like before).

If the user accesses a path like
"/edit/8d5c1f375ce99e5df84e26b0eafbf1448c6a001e/README", redirect the
user to the file detail page with a note, that he cannot edit a file
"on" a commit.

fixes #5482

GITLAB-1457 (GITLAB-836)

Change-Id: If8e2474bc6908accca51f395f58937687f101b58

"Created on" should be used when the timestamp is only a date.

Ensure that highlighted code blocks never get a text-shadow regardless of where they are or what theme is used.

Personl -> Personal