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

By Jiang Xin (4) and others
via Jiang Xin
* git://github.com/git-l10n/git-po:
  l10n: Set nplurals of zh_CN.po from 1 to 2
  l10n: zh_CN.po: translate 323 new messages
  l10n: zh.CN.po: update by msgmerge git.pot
  First release translation for Vietnamese
  Init translation for Vietnamese
  l10n: New it.po file with 504 translations
  Update Swedish translation (728t0f0u)
  l10n: Update git.pot (41 new messages)