Yeah, I think it says "that cannot extinguish/quench" rather than "that cannot be extinguished/quenched".

Anyway, as Teddymonster has already suggested, this really isn't a normal juxtaposition of words in English - it is being used for effect. It begs an explanation and lures you into trying to find out more about the story.

In that respect, samhradh dochloíte may not be normal in Irish but I think it would have the same effect.

It doesn't hurt to keep looking for other alternatives, but it appears that three (Scooby, Redwolf (?), and I) already agree on samhradh dochloíte on that basis.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

samhradh dochloíte

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.