translation(ja): Update Japanese translation (#13723)

ref: https://github.com/vim-jp/lang-ja/releases/tag/20231219

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/lang/menu_ja_jp.euc-jp.vim b/runtime/lang/menu_ja_jp.euc-jp.vim
index daa404b..809ef5a 100644
--- a/runtime/lang/menu_ja_jp.euc-jp.vim
+++ b/runtime/lang/menu_ja_jp.euc-jp.vim
@@ -1,10 +1,10 @@
 " vi:set ts=8 sts=8 sw=8 tw=0:
 "
 " Menu Translations:	Japanese (EUC-JP)
-" Last Translator:	MURAOKA Taro  <koron.kaoriya@gmail.com>
-" Last Change:		20-Feb-2022.
+" Last Translator:	MURAOKA Taro <koron.kaoriya@gmail.com>
+" Last Change:		18-Dec-2023.
 "
-" Copyright (C) 2001-2022 MURAOKA Taro <koron.kaoriya@gmail.com>,
+" Copyright (C) 2001-2023 MURAOKA Taro <koron.kaoriya@gmail.com>,
 "			  vim-jp <http://vim-jp.org/>
 "
 " THIS FILE IS DISTRIBUTED UNDER THE VIM LICENSE.