Thank you for reaching out to the Community with your question. I apologize you aren't able to translate the field names in your contact's sign up form. Unfortunately this is not a feature we currently provide. I would be happy to pass along your feedback for this feature to the appropriate team. However, a work around for this is to create custom fields for your contacts in the language you want. Once these fields are created you can then select them when creating your sign up form. If you did this, you would then have your field names it in both English and the language you are looking for.
Frankie P. Community & Social Media Support
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