Hi Nicholas, my name is Nicholas as well. As of this time, the Flat Earth Socity is an English biased forum. However, there is nothing in the rules that says you can't create topics in Spanish. I'm not sure that you will get a great response, but if you did, it may be a good "proof of concept" that the Flat Earth Socity should branch out.
Simply put, if you can show that there is a need for a Spanish sub-forum, we will consider adding it.