Czy pan/pani mówi po polsku? Do you speak Polish?
There is no such a destinction in English, where "you" is used for everything
If translating "pan/pani " into English you use: "Mr/Mrs do you speak Polish?"
or "Sir/Madam do you speak Polish"
"Czy muszą panstwo tak dużo mowić?" ?
Small error.
"Państwo" can be addressed as "Sirs/Madams" or if addressing group of people by "you" , "please" should be added to show respect . That's how word "Państwo" works in Polish language. We don't address unknown (or older) people by "ty/wy" (you).
Sirs/Madams do you have to talk so much?
or
Please, do you have to talk so much?