Hi mrkoozik,
Thanks for reaching out!
If you want to translate that sentence to your local language then I recommend the following webinar recording, which gives you the details: https://www.youtube.com/watch?v=63frO0szyd8&t=1s
Probably the easiest would be to use the Loco Translate plugin on your website.
Once installed and activated, look for the translation files of Event Tickets Plus. Choose the translation of your language.
First click on the Sync button to get the latest string set synchronized to your language file.
Then look for the string you would like to translate (e.g. “Scan this QR code at the event to check in.”), add the translation, save, and you should be done.
Hope this helps.
Cheers,
Andras