Merge branch 'maint' into master

* maint: (10 commits) l10n: de.po: translate one new message l10n: de.po: unify translation of "ahead" and "behind" l10n: de.po: collection of improvements l10n: de.po: translate "remote" as "extern" l10n: de.po: translate "track" as "beobachten" ... Conflicts: po/de.po