Hello @Federico_Giovannini.
Here i share with you a link related to translations.
App Inventor forum is based in HELP of each others and the same with the App Inventor as a Project in general. I think... if you have the good eye to recognize the error, you can contribute to fix it.
I do not speak Italian (maybe some words for heritage, because my family was migrant from Italy 4 generations ago), but the idea is: if you can do it, help us to have a better tool, for all of us. You will be helping your AI2 community for Italian speakers too.
I do try to help in Spanish (because i am Spanish talker), but we are at 100%, also the original (English), but seems Italian have a 80% ratio of translation, So your help will be of great value for the Italian Speakers.
Well I hope my comment have help you in some way.