Allow to insert Persian characters!

update line 132 to allow insert unicode letters in Persian language.

Author: sIiiS

app/code/Magento/Catalog/Controller/Adminhtml/Product/Attribute/Save.php

@@ -129,7 +129,7 @@ public function execute()
             $attributeCode = $this->getRequest()->getParam('attribute_code')
                 ?: $this->generateCode($this->getRequest()->getParam('frontend_label')[0]);
             if (strlen($attributeCode) > 0) {
-                $validatorAttrCode = new \Zend_Validate_Regex(['pattern' => '/^[a-z][a-z_0-9]{0,30}$/']);
+                $validatorAttrCode = new \Zend_Validate_Regex(['pattern' => '/^[a-z\x{600}-\x{6FF}][a-z\x{600}-\x{6FF}_0-9]{0,30}$/u']);
                 if (!$validatorAttrCode->isValid($attributeCode)) {
                     $this->messageManager->addError(
                         __(