you need to change the language in chrome. It seems your chrome have italian and english. Even if your chrome is in english windity will be in italian.
I have found in several places that there is a screensaver. I have tried to get the exe following this address https://www.windyty.com/download/windyty-screensaver-1.0.exe. But I could not get it, I can only see the animated map. Is it still available?