You can create your website event page in any language; however, we do not have automatic language select.
You can also update the system-generated language in the registration form (First and Last Name, Email Address, Phone Number, etc.) by going into your Event Dashboard, then going to Setup > Registration > Design/Text. Then, scroll down to the Translations/Tokens section and update as needed.
Please note: a Business or Enterprise subscription is required to update Translations/Tokens.