Merge https://github.com/j6t/git-gui

* https://github.com/j6t/git-gui: git-gui: fix inability to quit after closing another instance git-gui: sv.po: Update Swedish translation (576t0f0u) git-gui: note the new maintainer Makefile(s): do not enforce "all indents must be done with tab" Makefile(s): avoid recipe prefix in conditional statements doc: switch links to https doc: update links to current pages git-gui: po: fix typo in French "aperçu"