Spanish may have been a bad first language, but others like Korean, Icelandic, or even Russian would work as there is very little cross over or related language

Spanish may have been a bad first language, but others like Korean, Icelandic, or even Russian would work as there is very little cross over or related languages. You'd have to be careful with the input data, though, as it would be easy to corrupt your dataset with translations if you try and do this fast.