to answer the original question, the song would sound more or less like this in American English:

If you'll marry me, lassie, at the church of Birnie Bouzle
Until the day you die, lassie, you will never regret it
You will wear when you are married a gown and a plaid wool mantle
Sleep upon a featherbed, so comfortable and contented

You'll be so well dressed, lassie, going to church at Birnie Bouzle
Little shoes and all, lassie. My, but you'll be merry!
Your little dowry is but small, but homespun grey wool fabric will do for all our clothes
I'll save my money to dress you well, you will never regret it

If you'll marry me, lassie, at the church of Birnie Bouzle
Until the day you die, lassie, you will never regret it

We'll have lovely children and all, some pretty girls and sturdy boys
Like their mother, one and all, and your father, he's consented to the marriage

I'll hunt the otter and the badger, the deer, the rabbit, and the grouse
I'll pry the limpets from the rock to make you special meals
If you'll marry me, lassie, at the church of Birnie Bouzle
Until the day you die, lassie, you will never regret it.