Language of the fields in the registration form

Hi,

even if I set the language of the webinar in italian, the form showed in our site by the plugin still has the fields in English.
But the form in the link provided by gotowebinar is correctly in italian.

Since these fields are “first name”, “last name” and “email, I cannot create new fields instead of those because they are mandatory by default.

How can I have the fields of the form provided by GoToWp in my language?

Thank you.