I'd recommend waiting until you get a go-ahead from someone actually employed at SJG. Otherwise, you'd risk violating their
Online Policy.
I do not know their general policy on translations of rules to other languages, but given the number of GURPS translations I've seen offered at Warehouse 23, I'd presume you should be able to find someone at SJG willing to address this with you.
I'd recommend starting here:
http://www.sjgames.com/general/guidelines/authors/
Also, I'll go ahead and forward your question to the Powers That Be. ;-)
Hope this helps.
Franklin
__________________
Franklin W. Cain
Evil Game Master For Hire -- Have Dice, Will Travel
SJG
MIB # 9808; Net.Rep.: Chez G* and Frag