This is what I would like to know as well. A few years back Wizz did give preferance to locals, but at the moment nationality doesn't mean anything. Recruitment is done by foreigners.
I've always wondered about this focus on nationality that you see quite often in developing (perhaps "developing" in Hungary's case) nations - a pilot is ultimately an input into the system for it to function. Does anyone give a toss about the geographic origin of the oil that was drilled to provide jet fuel for your next flight stuffed with emigrating locals? I doubt it. What pilot nationality has to do with the price of fish is beyond me.