If you have filled the English (just like me I have filled both too) you don't need to send the urdu one, the check list is outdated and I think at that time the english version was not available. If you have registered the English nikah nama with Seal of registrar , it will be fine, you can also attest the english nikah nama from Foreign office.
But if you really want to get it translated, you can do it at Kachari in Islamabad they have a proforma ready made they just fill it and then Notary public attest it (it is very cheap like 100 rps max). Or 2nd option is from Foreign office, advantage of foreign office is that you can attest at the same time but there is a lot of rush there.