The load_plugin_textdomain() function had not the same textdomain as given in the PHP file of the plugin. I had written dummy names for this thread, therefore it could not be seen.
But I changed it. Also the .mo and .po files have to have the localization code as set in the WordPress database at WP_LANG. Strangely, there was no localization code in the database, the field was empty. I added it and named the files new, and now it is working!
This article helped a lot: https://localise.biz/help/wordpress/loading-translations
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