"I like Christmas."
Translation:Is maith liom an Nollaig.
If I read correctly galaxyrocker says "Nollaig = December" and "An Nollaig = Christmas".
So my question was regarding the question type where you have to match 2 words together. On these question it's always "Nollaig = Christmas" (without the an). Is this an error and it should rather be December?
Ah, right, sorry. Those are constructed automatically by the system, so they do not always take e.g. conjugation and inflection into account, and hence, they're not always very reliable. I administrate the Swedish course and I can honestly say it's one of my least favourite features.
Edit: To answer your question, it's my understanding that just Nollaig isn't used for December - rather, mí na Nollag is the right term - literally "the month of Christmas".
A very late reply, but in case someone is still wondering, this is what Wiktionary has to say:
From Old Irish Notlaic, from Latin nātālīcia (“a birthday party”), with specific reference to the birth of Christ, from nātālis (“natal”), from nātus (“born”). Compare Welsh Nadolig, Breton Nedeleg and French Noël.