Hi pisthai, interesting program. Don't you want to reach spanish speaker audience? I can help you to translate it.
First at all, I'm not the developer of this apps! If you like, you could easy contact them of the Link given above. On the other hand, English is the main language of computer and anybody and everybody need to to know Basic Englsih and also some Computer terms of English to work with computer. So, it shouldn't be a problem to work with Applications in English, even the native language differs!