Believe me, I would love to... but I really don't know what to do.
Right now, I don't know any way how to create a universal skin.
Turning an "English" skin into a Japanese one means substituting the ordinary fonts with Japanese ones (and maybe setting the Japanese charset for those fonts) - as Iso-G suggested,
MS Gothic should be OK (that's the system font on Japanese Windows). To be able to choose the font in the SkinBuilder, it's necessary to have this font - i.e. to install the Japanese language pack to the operating system where the skin is being editted.
Vlk said he'll make (or rather find) a brief document describing what items exactly should be changed... I didn't see it yet.
Unfortunatelly, this will gain a Japanese-only skin... for Russian version, another skin would have to be created (here, the fonts could remain mostly the same as in the English version, but the charset has to be set to 1251). Nothing universal here...
