Hi Juhani! Welcome to Feng Office Forums!
Thanks a lot for your contribution with the translation, we will be adding it in a future release! In the mean time, if you would like to contribute with Aslak and viceversa with it, it would be great! So feel free to do so and we will update it later on.
Do not worry that much about the errors you mentioned, that is quite normal.. and either way, it is better having the translation than none at all hehe
Best regards,
Francisco