The Spanish half of a Salvadoran file
A municipal office in El Salvador works in Spanish and acts on the words in front of it. An English birth or marriage record leaves a clerk with nothing usable. So the paper crosses as a pair: your English record, or a fresh copy of it, and a Spanish text that repeats every line, including anything printed inside a stamp.
Spanish, and civil status wording
A certified translation into Spanish in Wolverhampton uses the civil status terms a Salvadoran register recognises, since the wording for a marriage entry or a death registration is not the same across every Spanish-speaking country. Dates are written out in full so a UK order cannot be misread, and registration numbers are copied character for character.
The certificate that carries the text
What is accepted here is a certified translation with translator's certificate of accuracy. That page names the translator, the two languages, the date and the pages covered, and it states plainly that nothing was added or removed. It stays fixed to the Spanish text, because a file arriving without it has no standing however careful the Spanish itself is.
Rate per page and delivery
A certified translation for El Salvador is charged at roughly £25 / page of source and delivered in 2–3 business days, or 24 hours on the express lane. Ordering a whole family set in one go keeps the count tidy, and it means a single certificate covers records that a register will read together anyway.
Fresh certified copies, and the check at the counter
Wolverhampton Register Office at Civic Centre, St Peter's Square, Wolverhampton WV1 1RU issues new certified copies of UK birth, marriage and death records. Ordering one lets a replaceable copy travel while the record you already hold stays at home. That office issues records only; it does not translate them and signs off no Spanish text.
At the Salvadoran counter the certificate is read, the sheets are counted and the names are matched. An official Spanish translation in Wolverhampton runs into trouble when a passport shows a married name and a birth record shows a maiden one with nothing sent to connect them, so include both records from the start.