public static function optionsRestrictions($include_empty): array
    {
        $options = [
            'none'         => I18N::translate('Show to visitors'),
            'privacy'      => I18N::translate('Show to members'),
            'confidential' => I18N::translate('Show to managers'),
            'locked'       => I18N::translate('Only managers can edit'),
        ];

        if ($include_empty) {
            $options = ['' => ''] + $options;
        }

        return $options;
    }