I added Korean language file to our test site, but only core language file. http://install141.geeklog.jp/
You can select Korean language by Multi-language support.
Now, I am creating some Korean language files of plug-in.
Geeklog Japan https://www.geeklog.jp
I made korean language files for calendar, links, polls and staticpages plugins .
Now, I am making a korean language file for forum plugin.
Geeklog Japan https://www.geeklog.jp