For each one, I translated English to that language, then reversed it in the hopes that would provide the best version. I often found bardic wasn't in google translate's vocabulary so often switched to "Poetic Immunity" or "Immunity of the Poet". Some I had to get a little creative on -- "Lyrical Immunity" for Icelandic, "The Poet's Touch" for Samoan and "Shield of the Singer" for Sindarin just to name a few. For the conlangs, I really wanted to get in some Black Speech or Abyssmal since those might be useful to a bard in need of immunity, but I couldn't find anything definitive. :D
