Allow to return a sale on any branch.

The return process is made when visualize the client details.
When return a sale, the stock of current branch will be increased.
- Add tests.
- Update translation.

Change-Id: I0b71accd6afc337f5c536de0cd3967344a87447f
Fixes: http://bugs.async.com.br/show_bug.cgi?id=5664