User profiles are currently only possible in a single language. We're working on extending OJS's multilingual capabilities (i.e. additional article and journal metadata in different languages), and I'll make a note to consider extending user profiles similarly. Unfortunately you'll have to find a work-around for the moment.
Open Journal Systems Team
Don't miss the First International PKP Scholarly Publishing Conference
July 11 - 13, 2007, Vancouver, BC, Canada