"And if I'm going to see a show, I want to at least have a chance at understanding it all."
The large text in Italian was added later on into the process to reveal to the audience that despite the language, humans are humans and we can look past the language barrier. Also, having the audience confused on the langage allows them to really understand and feel Clara and Margaret's position in Florence.
"You never really understand a person until you consider things from his point of view - until you climb into his skin and walk around in it."
To Kill A Mockingbird