l10n: remove a superfluous translation for push.c

Ralf reported that '--recurse-submodules' option in push.c should not be
translated [1].  Before his commit is merged, remove superfluous
translations for push.c.

[1] http://www.spinics.net/lists/git/msg241964.html

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