You can mix as many languages as you like using Unicode - it doesn't care, it has all written languages in the same "code space". The problem is fonts. You need a single font which includes all the glyphs in all the languages. There are some ugly Unicode fonts that have a lot of languages in them, but you'd have to be pretty desperate to use them. I think Internet Explorer has a pretty
basic Unicode font in it by default, at least if you try some of the UNicode test pages on the net, they display in many languages at the same time.
Beyond that you'd need an application that could specify fonts for each run of text in each language.
A friend of mine has been asking to get Japanese working again in Openacs 4, so I'll try to get that done in the next week (commit commit)
