As far as I understand it, Alrik, every translation costs quite a bit of money to do and results in a different version of the game (So takes time as well as money). Every different language also needs its own version of any patches, of course, which adds even more work (And expense) down the line.
That cost needs to be balanced against expected sales and for many of the less spoken languages it just isn't cost effective. This is why most games are translated into around half a dozen languages at most.
This is what I have read, at least
