Here's a bit of the translation.
Welcome lady who faced such troubles
Your capture brought us to our ruin
With fine land usuped by thieves
And you sold to the foreigners.
Grainne O'Malley comes over the sea,
With armed warriors as her guard,
They're Irishman - not French nor Spanish,
And they will rout the foreigners,
Oh-ro You are welcome home
now that summer's coming.