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

* git://github.com/git-l10n/git-po: l10n: de.po: translate 54 new messages l10n: zh_CN.po: translate 54 messages (2048t0f0u) l10n: Update Swedish translation (2048t0f0u) l10n: vi.po: Update translation (2048t0u0f) l10n: git.pot: v1.8.3 round 1 (54 new, 15 removed)