Translate legend

Hello,

How can I translate the legends (available & booked)?

I’ve installed Loco translate & found & translated those strings but they still show up in english in both the front & back ends.

Using free plugin. Calendar is under a “Beschikbaarheid & Reserveren” button on page https://grandcafe-rene.nl/services/vergarderruimte/

The page I need help with: [log in to see the link]