Danish translation (added)
 

Here's my contribution:

$phrase['sign_guestbook'] = "Skriv i g&#230stebog";
$phrase['view_guestbook'] = "L&#230s g&#230stebog";
$phrase['return_to'] = "Tilbage til";
$phrase['name'] = "Navn";
$phrase['date'] = "Indsendt";
$phrase['email'] = "E-mail";
$phrase['location'] = "Land";
$phrase['message'] = "Besked";
$phrase['private_message'] = "Personlig Besked";
$phrase['added'] = "tilf&#248jet";
$phrase['page'] = "Side";
$phrase['of'] = "af";
$phrase['first'] = "F&#248rste";
$phrase['next'] = "N&#230ste";
$phrase['previous'] = "Forrige";
$phrase['last'] = "Sidste";
$phrase['private'] = "Privat";
$phrase['characters_left'] = "tegn tilbage";
$phrase['smilies'] = "Smileys";
$phrase['verification_code'] = "Kontrol-kode";
$phrase['post_message'] = "Send besked";
$phrase['preview'] = "Vis pr&#248ve";
$phrase['js_required_fields'] = "F&#248lgende felter skal udfyldes";
$phrase['no_messages'] = "Der er ingen indl&#230g i g&#230stebogen.";

Added by:
Kathrine H. Pedersen
http://litla-tunga.com/
kata@litla-tunga.com