Hi @jvdhelder,
I’m gonna assume your site is not a multilingual site, so Dutch is the only language available. If so, you can easily translate/customize the “and” string to anything you like. Just go to: Molongui > Authorship Settings > Byline. There you will see a toggle setting that reads like “As delimiter to separate last two authors names, use:“. Input there the string of your choice (“en” maybe?) and Save Settings.
Please let us know if this fixes your issue.
Thank you very much! I had not found this setting yet.