The language Malawi requires
A certified translation into English is required for documents used in Malawi, and that is the whole of the language rule. Because a record issued in Northern Ireland is written in English already, the rule bites only on the parts of a file that came from somewhere else. A certified translation into English in Belfast is work done on those sheets, not on the ones the register printed.
What a certificate of accuracy can attach to
A certificate of accuracy is a statement about a pairing: this source sheet, this English text, written by this person on this date. It cannot exist without both halves. That is why asking for one on a paper already in English gets you nowhere — there is no second version for it to describe, and nobody can sign for writing that was never done.
What the sheets that do need work have in common
The papers keeping this job alive are the ones issued elsewhere: a certificate from another country, a letter from a body abroad, an entry made in a language the rest of the folder never uses. Each becomes an English version with its own signed certificate. A certified translation in Belfast for Malawi is billed on those sheets alone, so the count is usually smaller than the folder looks.
Where the Belfast paper itself comes from
Northern Ireland keeps its own civil registration, so a birth, marriage or death registered in Belfast is issued by the General Register Office for Northern Ireland (GRONI) at Colby House, Stranmillis Court, Belfast BT9 5RR rather than by a registry elsewhere in the United Kingdom. That office works by post, and a fresh certified copy ordered from it arrives in English, ready to go into the file as it stands.
Cost and pace
The rate is about £25 for each page as issued, and standard production takes 2–3 business days once readable scans exist. A 24-hour route is available where a date is close. Because a certified translation for Malawi touches only the sheets that are not English, the bill follows the smaller pile, and deciding which pile each sheet belongs in is the first useful thing to do.