It goes without saying that I, too, loved this episode.
Ilana speaks Russian. Jacob may have used Latin as a go-between for all the languages and cultures.
I agree with iSm that Ricky's wish to live forever seemed off the cuff and that he should have been smart enough to know better, though GD's interpretation makes sense. They should have presented it as such.
ETA - should have hit refresh before posting...anyway, I think they presented it poorly.