We are in fact very considerate of those who aren't native English speakers. We constantly answer questions about English grammar and vocabulary, although we absolutely don't have to.
"Whose wife does speak english?" is indeed grammatically correct, but it doesn't work as a standalone sentence. It could work in this context:
- Neither Steven's nor Harold's wife speaks English.
- So, whose wife does speak English, then?
There is nothing in the original Polish sentence that would indicate such a context, so I would consider your sentence a far fetched interpretation and am not in favour of accepting it.