builtin/push.c: fix description of --recurse-submodules option

The description of the option for argument "recurse-submodules"
is marked for translation even if it expects the untranslated
string and it's missing the option "on-demand" which was introduced
in eb21c73 (2014-03-29, push: teach --recurse-submodules the on-demand
option). Fix this by unmark the string for translation and add the
missing option.

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/push.c

@@ -463,7 +463,7 @@ int cmd_push(int argc, const char **argv, const char *prefix)
 		  0, CAS_OPT_NAME, &cas, N_("refname>:<expect"),
 		  N_("require old value of ref to be at this value"),
 		  PARSE_OPT_OPTARG, parseopt_push_cas_option },
-		{ OPTION_CALLBACK, 0, "recurse-submodules", &flags, N_("check"),
+		{ OPTION_CALLBACK, 0, "recurse-submodules", &flags, "check|on-demand",
 			N_("control recursive pushing of submodules"),
 			PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 		OPT_BOOL( 0 , "thin", &thin, N_("use thin pack")),