Real talk though, in one campaign I did, I made a dragonborn barbarian that could only speak draconic. It pissed my friends off so much, but it was hilarious to me
My friend and I had a dynamic like that in a campaign. He was playing a dwarf barbarian who only spoke dwarven and I was playing a dwarf witch. When his barbarian would mouth off in dwarven about the party, my character would "translate" to something like, "He wishes you all good luck."