There was a person planning to work on a Spanish version, but I have not heard from him in over a year. I can't find his email at the moment, unfortunately or I'd put you in contact with him.
What I need to do, I think is to open a repository project for the documentation. Then we could treat it like any other project, giving access to contributors, allowing more group effort to be harnessed.
If you feel up to it, contact me directly and I'll get you the source document: http://puremvc.org/component/option,com_contact/Itemid,3/