I translated my birth certificate and made a copy of the "translated document" and sent it. I didn't send originals for anything and I hope that's enough.
Firstly, I am not sure if you mean that "you" translated the documents because for sure migration will not accept it. You can read it in the complete guide: "Important information: Translations must not be done by the applicants themselves nor by an applicant’s parent, guardian, sibling, spouse, common-law partner, conjugal partner, grandparent, child, aunt, uncle, niece, nephew or first cousin." Secondly, the certified translation document has to be sent exactly as the translator gave it to you, because it is the certified translation. Thirdly, it depends on your country requirements, but sometimes they ask for original (the original copy that the government gave you of your document) and certified documents, not copies that you can print online. This is what you can read in the complete guide, also, before sending my application, I hired a lawyer to review my package and he told me what it is required to send to migration office.