May I just remind everyone that the status of Toki Pona as a copyrighted language, assuming that languages are in fact copyrightable, does not preclude its also being licensed under the GFDL. As Sonja Kisa is the creator of the language and, as I understand it, the primary contributor on the Toki Pona Wikipedia, I would suggest that she has effectively licensed Wikipedia to use the language, even if she has a copyright.
It's exactly the same as any of us who retain copyright in anything we submit on Wikipedia.
--Michael Snow