[Answered ]-Should I include translation correctness in functional testing?

I dont know if your whole team speak Hungarian or not, but you should always writing code in English since every (decent) programmer know this language and neither you nor the other person will have problems with translation and understanding the code (at least not at the language-layer).

You never know, maybe in next year other team/company will take your project over ? Will you translate then the test to English ? Sounds like a waste of time.