steelsmiter:
Short of putting a post in your game of words you would otherwise put curly brackets around I don't think so. And if you tried to make everyone just know known words I think putting it inside the first language would confuse the system and bork the functionality of it.
About what I expected. I can think of a number of ways to implement a known-words/similar-words system, but I suspect they'd require a substantial amount of back end work. (You'd be looking at each character having a dictionary somewhere in the game of which words they know in which languages, and another set of dictionaries for which languages know words from other languages.)
Another question though, for characters with spaces in their name e.g. "firstname lastname", it won't trigger as a known word if you just use the first or last name. Easily worked around if you remember to {}, but it'd be convenient if it was automatic.