abuild: make it possible to override lang_subpkg

We alos introduce $langdir where you can set other dir to look for
localization dirs.

abuild.in

@@ -478,17 +478,25 @@ prepare_subpackages() {
 	fi
 }
 
-lang_subpkg() {
+default_lang_subpkg() {
 	if [ -z "$lang" ]; then
 		error "lang is not set"
 		return 1
 	fi
+	pkgdesc="$pkgname language pack for $lang"
 	arch="noarch"
 	install_if="$pkgname=$pkgver-r$pkgrel lang-$lang"
-	mkdir -p "$subpkgdir"/usr/share/locale
-	mv "$pkgdir"/usr/share/locale/$lang* \
-		"$subpkgdir"/usr/share/locale/ \
+	local dir
+	for dir in ${langdir:-/usr/share/locale}; do
+		mkdir -p "$subpkgdir"/$dir
+		mv "$pkgdir"/$dir/$lang* \
+		"$subpkgdir"/$dir/ \
 		|| return 1
+	done
+}
+
+lang_subpkg() {
+	default_lang_subpkg
 }
 
 prepare_language_packs() {