I found this link of plugins for wordpress to aid in multilingual site building. I’ve been experimenting with English/Spanish designs of one site I maintain using plain html (index.html.en index.html.es and the server gives the correct page depending on the browser localization. It seems as though there was an .htaccess change that I had to make as well although I don’t recall off the top of my head. (Maybe I can update if I read through it again.)