Use submenus in grub-mkconfig.

* util/grub-mkconfig.in: Define GRUB_ACTUAL_DEFAULT.
	* util/grub-mkconfig_lib.in (grub_quote): New function.
	(gettext_printf): Use gettext and not gettext_quoted to fix several
	messages.
	* util/grub.d/10_hurd.in: Use submenus.
	* util/grub.d/10_kfreebsd.in: Likewise.
	* util/grub.d/10_linux.in: Likewise.
	* util/grub.d/10_netbsd.in: Likewise.
	* util/grub.d/20_linux_xen.in: Likewise.
	* util/grub.d/30_os-prober.in: Likewise.
	* util/grub.d/10_illumos.in: Add missing quoting.
	* util/grub.d/10_windows.in: Likewise.

util/grub-mkconfig_lib.in

@@ -239,6 +239,11 @@ version_find_latest ()
 # One layer of quotation is eaten by "", the second by sed, and the third by
 # printf; so this turns ' into \'.  Note that you must use the output of
 # this function in a printf format string.
+
+grub_quote () {
+  sed "s/'/'\\\\\\\\''/g"
+}
+
 gettext_quoted () {
   gettext "$@" | sed "s/'/'\\\\\\\\''/g"
 }
@@ -249,7 +254,7 @@ gettext_quoted () {
 gettext_printf () {
   gettext_printf_format="$1"
   shift
-  printf "$(gettext_quoted "$gettext_printf_format")" "$@"
+  printf "$(gettext "$gettext_printf_format")" "$@"
 }
 
 uses_abstraction () {