Delete "da_DK" translation

[scootergrisen]

I would like the solus-sc "da_DK" translation deleted.

Curretly there is both "da_DK" and "da".

I have worked on the "da" translation which is an improvement of the "da_DK" translation.
But since both exists the "da_DK" is used when the users launch software center (because of LANG=da_DK.UTF-8 i guess).
The result being that users get to see old strings when using software center even though i imporoved them long time ago.

I asked for "da_DK" to be deleted long time ago. Must be over 1 year.
But the person i wrote with did not want to delete it.

I would be nice to have "da_DK" deleted for solus-sc so this problem can finally be solved.

Deleted "da_DK" from here and on Transifex and also delete the "da_DK" team on Transifex.