As Mamba said in this post, I've made a start on the htdocs/language/japanese/ files. My translations are probably a bit 'rough', so if anyone sees problems, please feel free to correct the files or send me corrections crip[at]moorey.net
I have also just finished translating htdocs/modules/pm/language/japanese and am now working on htdocs/modules/profile/language/japanese
If someone wants to try htdocs/modules/system/language/japanese please go ahead (and write here!).
Yoroshiku.
edit: Please can we have Japanese fonts enabled here at xoops.org? When I type Japanese characters, it looks like this: ?????????