Are languages not supported or enforced in any fassion?

If PC 'human' overhead 'elf_a' and 'elf_b' just say in chat, "(e) Let's kill human," how is it expected that 'human' respond?

I tend to completely disregard any (language) that's used and treat it as the common tounge that's spoken in our setting. Is that what others should be doing as well?

You respond any way you want. You would understand that, since languages aren't supported, but if you want to pretend that you didn't, that's fine.

Basically, however you wish to react is peachy fine.