She was queen of France, but she was born in Austria. Princesses tended to be married off to princes of other countries. Royals would also naturally learn at least a couple different languages because of this.
Look, senpai!Amadeus is talking to Marie in German!Oh, really!
I wonder what are they talking about?It's in their nature.I see that Servants from the same place tend to have conversations in their mother tongue.I'd utilize this opportunity and work hard to become a multilingual!
Well, just saying.Oh? Someone is speaking a language I never heard of...Yes, gladly!W-Why don't we go out for dinner?Are you free this afternoon?I'm free.