Your site language was set Korean, we changed to English and it's English now.

WordPress language setting is located in Dashboard > Settings > General admin page.

The site language should be in Korean, but not admin, so, i can use ko-kr.po file at front-end pages.

I wish your admin language follows admin language preference by user, not site language.

Thanks.

If site language is Korean then the whole wpForo is in Korean. I'm sorry but there is no way to make wpForo semi-Korean. So just change WP language to Korean and use Korean Menu.