patch 8.2.4420: menu translations are inconsistent

Problem:    Menu translations are inconsistent.
Solution:   Add a Makefile to convert between encodings. (Ada (Haowen) Yu,
            closes #9801)
diff --git a/runtime/lang/menu_vi_vn.vim b/runtime/lang/menu_vi_vn.vim
index 563ffa2..cc108d2 100644
--- a/runtime/lang/menu_vi_vn.vim
+++ b/runtime/lang/menu_vi_vn.vim
@@ -1,6 +1,7 @@
 " Menu Translations:	Vietnamese
 " Maintainer:		Phan Vinh Thinh <teppi@vnlinux.org>
 " Last Change:		12 Mar 2005
+" Original translations
 " URL:			http://iatp.vspu.ac.ru/phan/vietvim/lang/menu_vi_vn.vim
 "
 "