My name is Hideya Kawahara.
My main (but not many) contributions are related to fixing errors in Japanese-translated pages which are based on English ones.
Although in en.wikipedia.org doesn't show any of my contributions, you can find them out in ja.wikipedia.org: http://ja.wikipedia.org/wiki/特別:投稿記録/Hideya (I didn't know that en.wikipedia and ja.wikipedia are so disconnected in terms of user management...)
I can be accessed in English and Japanese.