Copy certification, translation and authenticity are different
A passport copy matching the actual booklet does not also certify a translation elsewhere in the application. If both a copy and translation are required, identify each certification and language separately. A university may request transcripts directly from the institution; a bank may specify the certifier and wording. Do not assume a notarized copy replaces every required record.
The focus is correspondence between the copy and the inspected document. Proof that a qualification was genuinely issued or that bank information is correct may require direct confirmation from the issuer. Further legalization does not expand copy certification into verification of every underlying fact.

