Does the certificate you received from the ward office say its a copy? If not then it looks like thats what you woukd send based on the link you provided up there. I am not a lawyer and it's not a legal advice but about 15 years ago i got something similar from ward office and transalated it from Nepali to english and had to notorize it. I hear now a days they actually provide it in English so no hassle of translating and notarizing it.