You can change the mapping for tour keyboard in Setting. Setting---> Text input----> Hardware keyboard layout , then choice your language . I have a french keyborad and i must choice US-QWERTY keyboard to play game like SuperTux or UrquanMaster
If someone makes working bindings for scandinavic keys, please share them here. I tried to bind the 'ä'-key to up, but it doesn't work. I think the optimal would be these: left = . down = left right = right up = ä