Translations:Locale/10/en
From Manjaro
KEYMAP=dk FONT=ter-118n
Troubleshooting
If you have followed the above guide and still have issues, there are possibilities of other files conflicting. Xorg, GDM and Plasma may have overriden your settings. The authoritative Archlinux wiki for locale is an excellent place to look for a solution and of course the Manjaro Forum is always the more welcoming community.