Merge branch 'maint' of git://github.com/git-l10n/git-po

* 'maint' of git://github.com/git-l10n/git-po: l10n: de.po: translate 108 new messages l10n: zh_CN: review for git 2.18.0 l10n: sv.po: Update Swedish translation(3608t0f0u)