The gettext .po files have a header, but it looks like the
translation specification for an empty string. This results in
_("") actually returning that header.
Check the input to _() and do not call gettext() on an empty string;
in some places, we run _(opts->help) where opts->help may be empty.
Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>