I have built a three-language shop. Almost everything is up and running which is great

1) A custumer using any of the two other languages than english cannot access his/her order history. It is only shown on the english language mode.
2) When customers enter their adress using the scandinavian "Æ", "Ø" and "Å"Characters - these are read as "?" Everywhere else on the site the translations via the alternative ISO codes work fine.
Hope for any help solving this

Thanks!
Jakob