Since the Rocky Talkies have the same functionality as a modern smartphone, text-to-speech is an option! It will still have the same accuracy though as you'd expect of a similar device so it may mishear and use different words as a result. Similarly, auto-correct will do its best but might have some difficulty translating things correctly based on what is input.

Regardless of someone's native language, they can also transcribe text or speech into whatever language is understood by the individual viewing or listening to a message.