Hi Hugo,
That is indeed not looking good. Inside the Intelligent Application Manager, you can navigate to Settings > Global translations. Here you find all global translation objects and their corresponding translations.
(in 2025.3 onwards at Web domains > Global translations)
For the Dutch (nl) language, you can search for the translation object verify_token_button and change the translation to Verifiëren.
That should do this trick. It may be necessary to restart Indicium after this change.
That did the trick, thank you.