Translation to dutch

Hello, how can I go about translating this text:
https://pasteboard.co/bxnmQwRgoOyn.png

I need it in dutch, my site is not multilingual, just one language (dutch).

I want it to show in dutch (don’t want extra plugins like wpml etc.)

Please any pointers, thank you.

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