Yes, everything you send should be translated to English. This includes the Form itself as well as all supporting documentation.
You may not translate the documents yourself. Instead, you must find a company or individual who is certified to translate your native language to English. This guarantees that all translations have been done word for word and that your Form and documents are accurate.
While this is an added cost to the process, it’s important as it might make the difference between getting approved or getting denied.