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_af_af.latin1.vim b/runtime/lang/menu_af_af.latin1.vim
index 46331e7..649c4e1 100644
--- a/runtime/lang/menu_af_af.latin1.vim
+++ b/runtime/lang/menu_af_af.latin1.vim
@@ -1,6 +1,7 @@
 " Menu Translations:	Afrikaas
 " Maintainer:		Danie Roux <droux@tuks.co.za>
 " Last Change:		2012 May 01
+" Original translations
 
 " Quit when menu translations have already been done.
 if exists("did_menu_trans")