If you have a website, you could speak to your webmaster to see if you can put buttons at the top, English, Spanish Etc. When clicked they will translate the listing to the selected language. Then, in the public remarks you could put something like, "Por Espanol, Vamo Aqui."
There currently is no way to list a home in MLS in a different language outside of using the public remarks field or other free form fields. Most of MLS are selection fields and fill in the blank. Even when you look at sites like Zillow.com that pull from MLS, they are in English.