Organizations that have constituents in multiple countries may want to have DIY forms in different languages.
It is not possible to choose the language for a DIY form. The language is controlled through your database's language locale which is listed under Management > My Organization > Preferences.
If you would like a form in a different language we do offer custom eCommerce pages through our Professional Services department. Your account executive can provide you a quote for that service. They can be reached at firstname.lastname@example.org.