Here is a better translation of the song for those of you who cannot cope with the one in the video...
Thunder tells us of a battle to be waged.
Flashes tear up the dark night.
Lashing hail and an icy wind. raging giants, the battle begins!
THUNDERGOD
Strongest of the Aesir, show us your might.
Unleash your hammer's devastating powers.
Thunder strikes the dark sky.
Mighty thunder, pounce into our hearts!
THUNDERGOD
DONAR, son of the Earth.
DONAR, Unleash your hatred.
DONAR, raise your hammer
DONAR, God who defeats the giants
Threatening skies, a war is unleashed.
Flashes and thunder awakens the land.
Eternal enemy of the giant scum.
Let them fall and bathe in their blood!
THUNDERGOD
The hammer of the gods, notorious among giants.
Brings flaming veins, forged in the sky.
The clouds tremble, the thundergod rides.
The fire of the heavens ignite when the thundergod battles!