I totally agree with PrinzMegaherz. A lot of my friends didn't buy the game because they only speak french.
On the other hand, I think Illwinter can't manage all these localization by themselves. They probably should link their game to a free localization library (GNU/Gettext is distributed under a GNU/LGPL licence)
Dominion has a strong and very international community and I'm sure there is some people in this community who are able and willing to translate the .pot files at a marginal (a free game and a photo of Kristoffer and Johan

) or no cost.
Look at the
Freeciv website how many Languages they support. Illwinter could sell a lot more copy of dominion 3 with such a broad localization.