The language barrier is often a barrier to communicating with locals. A few words learned in the local language are enough to break the ice. Hello, thank you, goodbye, how are you, yes, no, check please… are the first basic words you have to write them, with a bit of phonetics. They will be delighted with your help.
Then ask your guests if they have tried to communicate. Find out the results and if necessary teach them other words. Take this opportunity to also explain the rules of behavior, what to do better and what not to do. For example, in Southeast Asia, the Wai is the gesture of putting both hands on your chest to greet someone. However, it must be done in a certain way, not just any way. In your region, you surely have specific cultural specificities to introduce to your guests.