It’s never going to not be awkward until they all get over the awkward hump of getting to know each other. I think you are over thinking this. Surely your parents want to see you happy with a partner. Any good partner will learn to accept the others parents. They could all end up loving each other if you give them the chance. Maybe you can do activities that overcome the language barriers (movies with subtitles for your partner), games that dont need much talking to understand, walks, cooking meals together.

I can’t speak spanish but i have a good friendship with my stepmothers spanish brother, and same with her parents. You can understand a lot without saying very much sometimes. It is a bit boring and tedious but you do these things for family!