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_cs_cz.iso_8859-2.vim b/runtime/lang/menu_cs_cz.iso_8859-2.vim
index 1abf0c3..c93b84b 100644
--- a/runtime/lang/menu_cs_cz.iso_8859-2.vim
+++ b/runtime/lang/menu_cs_cz.iso_8859-2.vim
@@ -1,7 +1,8 @@
-" Menu Translations:    Czech (ISO-8859-2)
+" Menu Translations:    Czech (ISO8859-2)
 " Maintainer:           Jiri Sedlak <jiri_sedlak@users.sourceforge.net>
 " Previous maintainer:  Jiri Brezina
 " Based on:             menu.vim (2012-10-21)
+" Generated from menu_cs_cz.utf-8.vim, DO NOT EDIT
 
 " Quit when menu translations have already been done.
 if exists("did_menu_trans")
@@ -12,7 +13,7 @@
 let s:keepcpo= &cpo
 set cpo&vim
 
-scriptencoding iso-8859-2
+scriptencoding iso8859-2
 
 " {{{ File menu
 menutrans &File				&Soubor