Advanced languages

I agree. In previous version it was. But changed . So had to remove 'string' return type to solve problem.

I know that it is not good to change in system file.

PHP Code:

    function lang(string $line, array $args = [], string $locale = null): string
    {
        return Services::language($locale)
                        ->getLine($line, $args);
    } 


"getLine()" function returns string and array both, but "lang()" function returns only string. I think it's need to update