Ask your friend to translate. He should know English and that foreign language.
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Please submit certified translations for all foreign language documents. The translator must certify that s/he is competent to translate and that the translation is accurate.
The certification format should include the certifier's name, signature, address, and date of certification. A suggested format is:
Certification by Translator
I [typed name], certify that I am fluent (conversant) in the English and ________ languages, and that the above/attached document is an accurate translation of the document attached entitled ______________________________.
Signature_________________________________
Date Typed Name
Address
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USCIS no longer routinely requires submission of original documents or "certified copies." Instead, ordinary legible photocopies of such documents (including naturalization certificates and alien registration cards) will be acceptable for initial filing and approval of petitions and applications.
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http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextchannel=fe529c7755cb9010VgnVCM10000045f3d6a1RCRD&vgnextoid=ff053d146a7ee010VgnVCM1000000ecd190aRCRD