I need to localize Relation Manager tab

protected static ?string $title = 'xxx';

// or 

public static function getTitle(Model $ownerRecord, string $pageClass): string
{
    return __('xxx');
}

protected static ?string $title = 'xxx';

// or 

public static function getTitle(Model $ownerRecord, string $pageClass): string
{
    return __('xxx');
}