We wouldn't advise you to translate the official documents on your own since even the slightest mistake in spelling may force the authorities to deny your USCIS application, and then you would have to go through the entire application process again which also means paying more money.
If you still decide to translate this document on your own accord, you should verify the translation with a notary.
However, the best way would be to get a certified translation from the translation agency :applink
We are ready to provide such services and we can guarantee that your translated documents will be approved by USCIS.