Here's a slightly iffy translation that someone else can better

Rug Muire mac do Dhia,
Íosa Chriost, triath na reann,
Maireann dá éis ina hógh,
An bhean is dóigh do gach dall.

Mary bore a son to God,
Jesus Christ, lord of the heavens
Two lives lived in her youth (?)
The woman most hoped-for by every sinner. (?)

Buime a's máthair Mhic Dé Bhuí,
Bean mar í ní fhaca súil,
Bean ler osclaíodh Flaitheas Dé,
Do mholfas mé os gach dúil.

Foster-mother and mother of the Yellow Son of God
Eyes never saw a woman like her
The woman who would open God's Heaven
I praise her from every duty.

Ní cosúil í le mná,
Muire Mhór an bláth nach críon,
Ní cosúil balsam le moirt,
Le lionn goirt ní cosúil fion.

Women are not like her,
Great Mary, the flower who does not wither,
Balsam is not like clay
As beer is not like wine.