From the 129 form instructions:
Translations. If you submit a document with information in a foreign language, you must also submit a full English
translation. The translator must sign a certification that the English language translation is complete and accurate, and that
he or she is competent to translate from the foreign language into English. The certification should also include the date,
the translator’s signature and printed name, and may contain the translator’s contact information.
Copies. You should submit legible photocopies of documents requested, unless the Instructions specifically state that you
must submit an original document. USCIS may request an original document at the time of filing or at any time during
processing of an application, petition, or request. If USCIS requests an original document from you, it will be returned to
you after USCIS determines it no longer needs your original.
The day of the interview at the embassy you will have to show them the original divorce decree
i-129finstr.pdf