Well, this is what I call a "feels good to do action", but is not necessarily required IMO. I'm not aware of anywhere on USCIS's website where it says the translated copy or the certification has to be notarized.
I sense your frustration with regards to this issue. At the end of the day, anyone who feels more comfortable showing up with notarized certified translations should go ahead and get their documents notarized. However, I'm aware that USCIS, as per what's stated on their website, only requirefor translated copies of documents to be certified by whoever is translating the documents.
Under the
General Tips on Assembling Applications for Mailing (which a lot of those yet to send in their package might find useful also), it says:
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
http://www.uscis.gov/forms/forms-and-fees/general-tips-assembling-applications-mailing
Another section of the site,
Submitting Supporting Documentation (Instructions for Submitting Supporting Documentation for e-Filed Applications Only - yes, I know this says e-Filed applications but it's equally applicable to mailed in applications also) says:
Translations. Any foreign language document must be accompanied by a full English translation that the translator has certified as complete and correct, and by the translator's certification that he or she is competent to translate the foreign language into English
http://www.uscis.gov/forms/file-my-application-online-e-filing/submitting-supporting-documentation
Neither of these 2 sites says anything about notarization!