tl;dr How do I deal with translations?

Chinese users asked for translations for ages, one guy did it all, but then? I needed to update the app, I had added some new strings, the guy didn't replayed. Obviously, as I didn't wanted to pay, I've used Google Translate. Result? "Good app, but the translations are wrong.", nice!

What can I do? Do I remove the Chinese translation and tell them to fuck off?