Yes, if the certificate isn't in English or Irish. ISD asks for a full translation that includes the translator's confirmation of accuracy, the date, their full name and signature, and their contact details.
Join-family applications, whether you're joining an Irish citizen or a non-EEA family member living here, rest on proving the relationship, and the marriage certificate is the headline evidence. ISD's checklist asks for the original and the certified translation together, and it returns original marriage, birth and death certificates once it's finished with them. (Bank statements, less sentimentally, it keeps.)
If you married in an EU or EEA country or Switzerland, ISD also accepts the Extract of a European marriage certificate issued under the convention on multilingual extracts from civil status records, and an EU certificate with a Multilingual Standard Form doesn't need a translation.