Getting back to the original post, which mentioned a Gaelic chorus - I asked Margaret Stewart, a Scottish Gaelic singer, about this; here's what she had to say:

Willie John MacAulay used to sing a translation of Red River Valley it many years ago - it may even be on one of his old recordings.

There was a phase of 'Country & Western' translations for a time when I was young - it may have been in the 60's or 70's. There was even a Gaelic tv programme with the same theme. It was DIRE !!!