No, notarizations of translations are not required. However, you must submit an English language translation with each foreign language document.
No special actions are required for translations other than what USCIS has specified.
All documents must have a complete English translation to establish eligibility. You submitted documents which are in a language other than English. In order for USCIS to consider this evidence, you must submit English language translations for each document. The translator must certify that:
1.) the translations are accurate and complete; and
2.) he or she is competent to translate from the foreign language into English.
Financial records may need to be "audited" by a qualified accountant (CPA). It depends on what types of documents are involved.