When I look in the .po file the following is already translated:
day = dag
days = dage
But as you can see in my screenshot it's not translated.
Du betaler DKK 25.00 hver 30 days.
Prøveperioden på 14 days er gratis.
Nor can I find this text in the .po file "Please check the details of the membership below and click on the relevant button to complete the signup."