Okay, just finished the translation... here ye go :)

I WENT OUT ONE SUMMER'S DAY
Translation of Grundtvig's 'Jeg gik mig ud en sommerdag', by Freso (2003)

I went out one summer's day to hear
birdsong that the heart might touch
In the deep vales,
among nightingales,
and the other wee birds of song, speaking.

A little bird sat in the beechvale,
sweet it sang in the summereveningtime,
In the deep vales...

It sang so sweet of loveliest plains and fields,
where [kærminder]* grow as grass in meadows.
In the deep vales...

It sang of all that is nice to hear,
most preffered what deeply the heart can touch.
In the deep vales...

It sang as no other birds do sing,
played pleasantly with my mother's tongue.
In the deep vales...

It sang as spoken out of my own heart,
tones gave it all my delight and pain,
In the deep vales...

I then hummed as quietly into the eveningtime:
Fly, Goldie, fly round the beechvale.
In the deep vales...

Oh, fly from Øresund to Dannevirke,
sing for dance, for school and for church.
In the deep vales...

In the people's native tongue, with Denmark's tongue,
sing, as no other birds do sing.
In the deep vales...

The all with mothers dear will feel,
it is good in the Danish coun-te-ry to be.
In the deep vales...

Then all will shine, upon which the sun has shined,
as the reddened gold in the mother's tongue.
In the deep vales...

*: I think a kærminde is a kind of flower, but I'm not too sure... weren't in any of my dictionaries... :/