[LyX/master] Update ja.po

[Koji Yokota]

commit f4e129b65f064155dd1e6ce119fc532074640b50
Author: Koji Yokota <yokota at lyx.org>
Date:   Fri Jul 3 09:15:11 2026 +0900

    Update ja.po

 po/ja.po | 10639 +++++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 7243 insertions(+), 3396 deletions(-)