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

By Byrial Jensen (2) and others
via Jiang Xin (1) and Ralf Thielow (1)
* 'maint' of https://github.com/git-l10n/git-po:
  l10n: Initial German translation
  l10n: Update Simplified Chinese translation
  l10n: Update git.pot (2 new messages)
  l10n: Add the German translation team and initialize de.po
  l10n: Add Danish team (da) to list of teams
  l10n: New da.po file with 0 translations
  l10n: Updated pt_PT language