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_no_no.latin1.vim b/runtime/lang/menu_no_no.latin1.vim
index 1a5bb40..4e3e6f0 100644
--- a/runtime/lang/menu_no_no.latin1.vim
+++ b/runtime/lang/menu_no_no.latin1.vim
@@ -2,6 +2,7 @@
 " Maintainer:		Øyvind A. Holm <sunny@sunbase.org>
 " Last Change:		2020 Apr 23
 " menu_no_no.latin1.vim 289 2004-05-16 18:00:52Z sunny
+" Original translations
 
 " Quit when menu translations have already been done.
 if exists("did_menu_trans")