Translate Username to something else from WP login page

// Translate Username to something else from WP login page
function login_function() {
    add_filter( 'gettext', 'username_change', 20, 3 );
    function username_change( $translated_text, $text, $domain )
    {
        if ($text === 'Username')
        {
            $translated_text = 'customLoginName';
        }
        return $translated_text;
    }
}
add_action( 'login_head', 'login_function' );