RobertoCGarcia

function validateCaptcha(){
	     var valueGr = document.getElementById("g-recaptcha-response").value;
	     if(valueGr == null){
		     return false;
	     }else{
		     return true;
	     }
}

$(document).ready(function () {

RobertoCGarcia

  $language = \Drupal::languageManager()->getCurrentLanguage()->getId();
  $user = \Drupal\user\Entity\User::create();
  $user->setPassword($form_state->getValue('pass'));
  $user->enforceIsNew();
  $user->setEmail($form_state->getValue('mail'));
  $user->setUsername($form_state->getValue('name'));//This username must be unique and accept only a-Z,0-9, - _ @ .
  $user->set("init", 'mail');
  $user->set("langcode", $language);
  $user->set("preferred_langcode", $language);
  $user->set("preferred_admin_langcode", $language);