Hi @russo177x,
You can learn more about how to use the Google Sign-in with your own translated text here:

https://developers.google.com/identity/branding-guidelines#g+signin-social-scopes

Basically, you can create your own button's text. Or you can do something like this:

Sign in with:

Why, in the italian file, the short version is correct and the long one is in english?

This is the source file:
https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.it.PEsbfaTdrM4.O/m=signin2/rt=j/sv=1/d=1/ed=1/am=wQE/rs=AGLTcCPXGA_pTZEJDJXJNjx80GQ37vEYTA/cb=gapi.loaded_0

This is still a problem in my opinion, I tried to set the locale property of the button to every possible thing but it just gets the browser default...

Has this issue been resolved yet?

Not sure, i was not able to find solution then...