Thanks mldarshana for your reply,
I've carried out everything as outlined in the post but the translations are still not showing.
In the screeshot you can see the strings that i've translated.
I've disabled alle plugins just to make sure but this they were no conflicts but it did'nt help.
I've also encountered another issue and that is the header slider (REv slider) on the home page will not display anymore.
The link to the site in question is https://joepdohmen.nu, wiil you have a look.