My father emigrated to Argentina after the Irish Civil War. He'd meant to go to the Staes, but he'd have needed the visa. And he had to get out of the country.
He lived there for 12 years, and married my mother there, (who'd also gone out to work there) before coming back, and my brother was born out there. My father's brother joined him, and he married an Argentine lady, and lived the ret of his life there, and had s son, and grandchildren and so on.
The point is, there are a lot of Irish out in Argentina, and most of them speak Spanish as their first language. (And Che Guevara was one of them.) So you should feel at home in an Irish bar in Buenos Aires.