l10n: Update git.pot (11 new, 7 removed messages)

Generate po/git.pot from v1.8.1-476-gec3ae6e, and there are 11 new and 7
removed messages.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
Merge branch 'master' of git://github.com/ralfth/git-po-de

* 'master' of git://github.com/ralfth/git-po-de:
  l10n: de.po: fix some minor issues