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_hu_hu.iso_8859-2.vim b/runtime/lang/menu_hu_hu.iso_8859-2.vim
index 27c460f..262f044 100644
--- a/runtime/lang/menu_hu_hu.iso_8859-2.vim
+++ b/runtime/lang/menu_hu_hu.iso_8859-2.vim
@@ -2,6 +2,7 @@
 " Original Translation:	Zoltán Árpádffy
 " Maintained By:	Kontra Gergely <kgergely@mcl.hu>
 " Last Change:		2020 Apr 23
+" Original translations
 " I'm working on defining (unaccented) hotkeys for everything.
 " I want to remove y and z hotkeys, because on the hungarian keymap they're at
 " a differrent place.