Portuguese, and the translation is fine!
It's great to have our native language in LFS!

Quote from LiveForBoobs :

And because i can play it on my mother language.

good point, most games don't support Portuguese
LFS is the best sim I know so far, after I started playing it I haven't played anything else!

I play in a small league in a server with some others friends and we played with FXO last season. Most races had between 8-10 players, and
the best tracks for close racing were Aston Historic and Blackwood.
There were 15 min. of qualifying and 2 races (the second with inverted grid positions)
You can see the replay of the Aston Historic race (I don't know if it's allowed to post videos )
http://www.youtube.com/watch?v=QAXt-26wkB0
http://www.youtube.com/watch?v=2ICxcDtfHj0

And sorry for my bad english!