Bjarne, I've tried translating poetry from one language to another, and I've always hated the results. If you're hoping for results that are good poetry, your translation must usually be very loose; and all you can hope for is to convey part of the meaning and part of the impact of the original.
So....I avoid attempting poetic translations of poetry, like the plague.

Giles did a pretty good job, although I'd fit in "betray" instead of "wray" and not worry too much about being a slave to the meter.

-Joe-