BETA: Translation of the new version 4

The translations are made by volunteer users.
The current translate files need updating.
Here is how to update one:
https://www.fastsecurecontactform.com/how-to-update-translation

I’ve already tested this and loaded up the to language files. But it seems that none of the translated strings are used by the plugin. Everything stays in English. I’ve also checked the language parameter in wp-config.php. Everything looks fine but the translation doesn’t work. ??