Merge git://repo.or.cz/git-gui

* 'master' of git://repo.or.cz/git-gui: git-gui 0.13 git-gui: avoid mis-encoding the copyright message on Windows. git-gui: Update Swedish translation (521t). git-gui: ensure correct application termination in git-gui--askpass git-gui: handle textconv filter on Windows and in development git-gui: use shell to launch textconv filter in "blame" git-gui: display error launching blame as a message box. git-gui: Make usage statement visible on Windows.