Here is a brief interview with Kersti Juva, who first translated The Lord of the Rings 50 years ago into Finnish, but has now made some updates. (Article is in Finnish)

The Lord of the Rings gets an improved translation

A related article (also in Finnish) from two years ago also interviewing the translator -

Kersti Juva tells what it was like to translate The Lord of the Rings into Finnish: "Orkki is my gift to the vocabulary of the Finnish language"