OwnerRez makes it possible to add a tag to a guest’s contact info, indicating that the guest prefers to communicate in a specific language other than English. This video will walk you through how to set this up inside your OwnerRez account.
You can translate your legal documents into that language using an online translation service like Google translate or other method, then create a trigger to send your translated legal agreement automatically, when a booking is created for that user with that specific tag.
Read more about tags here.