I spoke with with Paul Barrett (who wrote the font manager and has
done a lot of work with fonts/text) about your problem and neither he
nor I have any immediate insight into your problem, so I just wanted
to let you know that we'll look into it and see if we can improve
international / unicode support, but it may be a little while before
we can solve this problem.
Thanks for letting us know.
That's ok, I must say that seeing the silence around my mail I understood that this should be the first time this kind of problem occurs!
I know that internationalization is not a simple issue so I would not be surprised if it is not quickly solved. Let me know if you need volunteers for testing.