Benjamin's versions does not fit the two lines in my version (and I can't imagine I'm so far off that it''s unrecognizable). I'll be back next week with the Clannad lyrics to see whether the other parts fit.

Two possible solutions for Kiwi to get the Clannad version lyrics:
I snailmail them to someone without security problems who can read Gaelic and is willing to type them.
Someone can direct me to a page with transcription rules from the Gaelic to the usual alphabeth and I'll type the lyrics.

Wolfgang