i18n: builtin/rm.c: remove a comma ',' from string

Remove a comma from string marked for translation. Make the string match the
one in builtin/mv.c. Now translators have do handle this string only once.

Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/rm.c

@@ -314,7 +314,7 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 		list.entry[list.nr].is_submodule = S_ISGITLINK(ce->ce_mode);
 		if (list.entry[list.nr++].is_submodule &&
 		    !is_staging_gitmodules_ok())
-			die (_("Please, stage your changes to .gitmodules or stash them to proceed"));
+			die (_("Please stage your changes to .gitmodules or stash them to proceed"));
 	}
 
 	if (pathspec.nr) {