Merge git://github.com/git-l10n/git-po

Updates to German, Vietnamese and simplified Chinese translation.

* git://github.com/git-l10n/git-po:
  l10n: de.po: translate 27 new messages
  l10n: Update  po/vi.po to v1.7.11.rc2.2.gb694fbb
  l10n: zh_CN.po: translate 27 new messages
  l10n: Update git.pot (27 new, 1 removed messages)