I went there a couple months ago, and it seemed like all the native folks spoke Irish (Gaelic) to some degree. It was pretty surprising, I thought I’d have to go to the west coast to get away from English, but nope, signs everywhere were printed in Gaelic and even the first cabbie I encountered in Dublin was more than happy to chat about linguistics!
If it’s labeled “holy” I assume a priest stuck his willy in it, so no.