I have the strangest thing going on. My WordPress installation is done through the hosting providers control panel called Direct Admin.
I have chosen the dutch language.
I installed the plugin. But it won't show the dutch language. It stays in english. I looked at the wp-config file to see if WP is really set to dutch and I see
when I change it to nl_NL my WP admin panel changes it's language from dutch to english and contact form 7 still isn't in dutch.
When I change wpcf7-nl_NL.mo to wpcf7-nl.mo Contact form 7 is in dutch but when someone does not fill in a required field the error message is in english even though it has been translated in the po file (I have checked).
I tried an alternative route by translating the english text in the functions.php of contact form 7 but that also doesn't work.
I am lost and need help.