Hey, I noticed you were never replied to here. If you still need a full translation, please let me know via PM. 
Off the top of my head, I can translate the choruses.
Þú ert sú minning,
You are the meaning,
sem lýsir myrkur hugans
that lights up my mind
ég man þig oft um nætur.
I think of you often in the night.
Nóttin er svo dimm.
The night is so dark.
Þú ert sú minning
You are the meaning
and
Þú ert sú minning,
sem lýsir myrkur hugans
ég sé þig oft um nætur.
I see you often in the night.
Svo margt sem minnir á..
You are the meaning of...
Þú ert nóttin.
You are the night.
Minä olen horjunut, epäilen enemmän kuin ennen
Mutta halusit ihmisen, sen viat, sen heikkouden