[ticket/11226] filespec::move_file() should error correctly

PHPBB3-11226
[ticket/11226] Use $user->lang()

PHPBB3-11226
[ticket/11226] Add tests

PHPBB3-11226
[ticket/11226] Explicity set file_moved to false

PHPBB3-11226
[ticket/12611] Remove phpBB Group copyright notice from .gifs

PHPBB3-12611
Merge pull request #2432 from Nicofuma/ticket/11226

[ticket/11226] filespec::move_file() should error correctly

* Nicofuma/ticket/11226:
  [ticket/11226] Explicity set file_moved to false
  [ticket/11226] Add tests
  [ticket/11226] Use $user->lang()
  [ticket/11226] filespec::move_file() should error correctly
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/11226] Explicity set file_moved to false
  [ticket/11226] Add tests
  [ticket/11226] Use $user->lang()
  [ticket/11226] filespec::move_file() should error correctly
Merge pull request #2511 from Marshalrusty/ticket/12611

[ticket/12611] Remove phpBB Group copyright notice from .gifs

* Marshalrusty/ticket/12611:
  [ticket/12611] Remove phpBB Group copyright notice from .gifs
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12611] Remove phpBB Group copyright notice from .gifs