Yo uso mas "desafortunadamente" , nunca uso "infortunadamente" , pero para agregar mas dudas al tema : Existe el sustantivo "infortunio" pero no "desafortunio"

1) In a game, I read: "Norte dame was one of the first buildings to employ flying buttresses, which allowed for much thinner walls around the choir. Personally, the last thing I'd want near a choir is a thinner wall. Lock them in, soundproof the bugger." What does it mean? "lock them in sound proof the bugger"?

-It means the person saying that disagrees with the use of flying buttresses, he/she prefers a thicker wall that would prevent sound from escaping the building.


2) What does "you can charitably describe it as bad" mean?

- I think it means the thing he/she is describing is hugely bad so describing it as just "bad" is leinient , maybe extending the context would be useful for a proper assessment.

Es una forma poética de referirse a lo que desea ese corazón, desea sentir, sea amor o dolor o un sentimiento tan fuerte como aquel de un puño apretándolo.