Why not "it was just an awful night"?
It's in the syntax. That is to say, "an oidhche" means "the night" and "Bha" is the past tense of "Tha." It would be a different translation if you were defining "it" as "night" in your example. Hope this helps! Slàinte.
Just listening (not reading) I'm hearing "Tha" instead of "Bha" in the audio. Is that just my unpracticed ears?
Remember that 'bh' is pronounced 'v'
Would 'the evening was just horrible' also not be correct?