How can I get a Spanish version of the website and/or all of the forms?

At this time, we do not support other languages. I've passed your suggestion on to the team for consideration as a future enhancement.

There are a lot of customization options currently available, though I don't know if they'll be sufficient to meet your needs.

Much of the content on the main page can be customized, though things like headings, menu text and button labels cannot.

Many fields on the registration form can be renamed. However, the "system required" fields cannot. Also, we currently have the email field set so it can be updated, as some users want not to be required, but others do not. However, if you rename that field, registrants won't receive their welcome email. (We currently figuring out what to do about that.)

For the form fields that cannot be renamed, you can add additional text above the field using a "heading" or "display only text" field. This certainly isn't ideal,but it may help.

You can customize the text that appears in the registration confirmation email.

I don't know whether this is enough for you to get by with the current system, but it's what is currently possible.