So your wife isn't willing to learn English and yet judges someone who equally chooses not to learn her language? What makes her so special?
First of all, speaking a language (or not speaking) has nothing to do with translating apps. Why?
1) if you can speak e.g. Spanish it doesn't mean you can automatically be a good translator.
2) I'm a native speaker of Polish, have quite a good command of English, can speak some Spanish and German. Nevertheless I wouldn't like to translate my apps if I were a developer, because I wouldn't have time to do that. Depending how much text there is to translate is more convenient and money-efficient to outsource translating.
My point was and still is that my wife (like 95% of non- English population) doesn't care to use English applications, because she doesn't speak it.
BTW, Translatting cost is not as high as many people think provided you think smart. In my country translating 1800-character page of English cost about 40-45zl that is 10-15$. If you want to check if i'ts profitable to target customer in a given language, translate just App Store description (some agencies even give you one translated page for free to help you see their proficiency) - no hard programming skills necessary. If you see increase in sales, go further and translate you app altogether.
Where there's a will (for money), there is a way.