Sorry, I don't speak Japanese, but there is no localization for the error on Profile Settings Page.
(翻訳:すいません、日本語は喋れないのですが、プロフィール設定画面のエラーがローカライゼーションされていないことに気づきました。)
I certainly hope so :) it's impossible to tell for sure though, it depends on when the devs working on Q&A want to ship something to prod. Although if I had to bet, I'd say it's going to happen soon