common-main: call git_setup_gettext()

This should be part of every program, as otherwise users do
not get translated error messages. However, some external
commands forgot to do so (e.g., git-credential-store). This
fixes them, and eliminates the repeated code in programs
that did remember to use it.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

upload-pack.c

@@ -823,8 +823,6 @@ int cmd_main(int argc, const char **argv)
 	int i;
 	int strict = 0;
 
-	git_setup_gettext();
-
 	packet_trace_identity("upload-pack");
 	check_replace_refs = 0;