i18n: git-submodule add git-sh-i18n

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-submodule.sh b/git-submodule.sh
index bf110e9..816ab3d 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -14,6 +14,7 @@
    or: $dashless [--quiet] sync [--] [<path>...]"
 OPTIONS_SPEC=
 . git-sh-setup
+. git-sh-i18n
 . git-parse-remote
 require_work_tree