New port: misc/locale-en_DK: Wonderful en_DK.UTF-8 locale

This is a FreeBSD port of the en_DK.UTF-8 locale.

See the blog post by Ivan Voras to learn more about this special locale:
http://www.ivoras.net/blog/tree/2010-12-20.the-wonderful-en_dk-locale.html

WWW: https://github.com/0mp/en_DK.UTF-8

PR: 137870
Reviewed by: swills
Differential Revision: https://reviews.freebsd.org/D22216