Hey!
Thanks for reaching out, you can customize the value of the notice adding a new filter into your functions.php file. As follows:
function tribe_events_set_notice_past_events( $notice, $key ) {
if ( 'event-past' === $key ) {
$notice = 'This is my custom message for this one';
}
return $notice;
}
add_filter( 'tribe_events_set_notice', 'tribe_events_set_notice_past_events', 10, 2 );
However I’m not really sure on what language you are trying to show this message as it might be due we still have some outstanding areas of the translations in different langugaes as you can see on this article.
Please let me know if you have any additional questions about this.
Best.
Crisoforo