Secondary evidence doesn’t necessarily mean translation of citizenship certificate will be enough. Does it list both of your parents’ name? If you are from 80’s, it will have father’s name only. The best is the Affidavit of Supports from both parents. You can also include the copy of citizenship certificate and its translation. Anyone can translate it anywhere, just need to write the statement Something similar to “ i certify that the translation is complete and accurate and I am fluent in English and Nepalese language” and then sign, date, provide name and contact info.