I translated the game (Wolf3D) into Icelandic this summer. It is available for download
Here. It's called "Wolf3D In Icelandic" and it's in the "Registered Wolf3D" section.
Unfortunately, it only works with version 1.4
1.1 can't get past level 3 in episode one. There is an error in the map file, which the version 1.4 exe file crashes on (The source code which was released is of v1.4)
I'm not sure about the other episodes. I only have version 1.4 to test with.