Hi Mario,
I’m sorry to hear that! In this case I would recommend you to use a template override to change this word in the Single Event page:
Please copy the single-event.php file from the-events-calendar/src/views/
Paste it on [your-theme]/tribe-events/single-event.php and modify line 28 by replacing the word “All” with the correct translation.
I hope this helps! If you have any other questions at all please feel free to let me know and I’d be happy to help as best I can!
Cheers,
Patricia