l10n: git.pot: v1.8.3 round 1 (54 new, 15 removed)

Generate po/git.pot from v1.8.2.1-342-gfa728 for git vl.8.3
l10n round 1.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>

Author: jiangxin