Fix the organizer and venue slugs (don't translate them!)

add_action( 'init', 'fix_tribe_venue_org_slugs', 11 );

function fix_tribe_venue_org_slugs() {
    if ( ! class_exists( 'TribeEvents' ) ) return;
    $tribe = TribeEvents::instance();
    $tribe->postVenueTypeArgs['rewrite']['slug'] = 'venue';
    $tribe->postOrganizerTypeArgs['rewrite']['slug'] = 'organizer';
}