redirect wp default register page to custom made one

sarvenaz.php

<?php

function wpse127636_register_url($link) {

    return str_replace(site_url('wp-login.php?action=register', 'login'),site_url('ثبت-نام', 'login'),$link);
}
add_filter('register','wpse127636_register_url');

function wpse127636_fix_register_urls($url, $path, $orig_scheme) {

    if ($orig_scheme !== 'login')
        return $url;

    if ($path == 'wp-login.php?action=register')
        return site_url('ثبت-نام', 'login');

    return $url;
}
add_filter('site_url', 'wpse127636_fix_register_urls', 10, 3);