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

Update German and Simplified Chinese translations. * 'maint' of git://github.com/git-l10n/git-po: l10n: de.po: correct translation of a 'rebase' message l10n: Improve many translation for zh_CN l10n: Unify the translation for '(un)expected'