Riddles within Riddles

It's actually something of an in-joke.

JUDSON: (reads) Let the chains of Fenric shatter. Even with an alphabet more than a thousand years old, the Ultima machine can reveal it's meaning.
DOCTOR: It can translate it, but who knows what it might mean?*

The point, of course, is that what the inscription is supposed to mean, and what the words in it actually mean, are no less than four different things. In the story the inscription is supposed to mean literally 'Let the chains of Fenric shatter'. And this indeed has another, deeper meaning which when, er, programmed into a computer, will then, in a slightly dodgy, psionic-y, Season Twenty-Six-type sort of a way, start putting Fenric's final programme into operation, waking up the Haemovores at Maidens' Point to look for the Flask, which, er, contains Fenric.

The runes as written, alas, don't mean very much. Quite a bit, clearly, as been lost in transliteration.

ᛚᚨᚢᚲᚨᛉ:
ᛊᚨᛚᚾᛊᚨᛚᚢ:
ᛚᚢᚹᚨᛏᚹᚨ:
ᛚᚨᚢᚲᚨᛉ:

The ash runes are all the wrong way roung and the elk is upside down. The fourth rune in the second line, meanwhile, is a need rather than an aurochs, as it should be. And in the third line the lake at the beginning should probably be a Tiw (though that mistake, at least, is based on an actual archaeological source), and between the other Tiw and the game there should be another aurochs.

In actual fact, of course, corrected the runes themselves ought to read

ᛚᚨᚢᚲᚨᛉ:
ᛊᚨᛚᚢ ᛊᚨᛚᚢ:
ᛏᚢᚹᚨ ᛏᚢᚹᚨ:
ᛚᚨᚢᚲᚨᛉ:

LAUKAZ
SALU SALU
TUWA TUWA
LAUKAZ

And literally they mean

'Leek
Hail Hail
Tove Tove
Leek'

'Leek' could of course mean 'garlic', which would at least fit with the "Dracula" theme of the story, though for the Vikings it almost certainly had a magical significance of its own. The second line is a religious or magical address to a deity or demon. 'Tove' is a feminine given name, derived from 'Thor'.

* Indeed, Nurse Crane's 'But who cares?' immediately after this exchange, given that she may be channelling audience members who by this point may well have given up on an overly convoluted plot, is way post-modern.