MAGETWO-84272: Update AbstractBackend.php magento#12120

Author: Oleksii Korshenko

app/code/Magento/Eav/Model/Entity/Attribute/Backend/AbstractBackend.php

@@ -237,7 +237,8 @@ public function validate($object)
             && $attribute->isValueEmpty($value)
             && $attribute->isValueEmpty($attribute->getDefaultValue())
         ) {
-            throw new LocalizedException(__('The value of attribute "%1" must be set', $attrCode));
+            $label = $attribute->getFrontend()->getLabel();
+            throw new LocalizedException(__('The value of attribute "%1" must be set', $label));
         }
 
         if ($attribute->getIsUnique()

dev/tests/api-functional/testsuite/Magento/Customer/Api/AccountManagementTest.php

@@ -579,8 +579,8 @@ public function testValidateCustomerData()
         $validationResponse = $this->_webApiCall($serviceInfo, $requestData);
         $this->assertFalse($validationResponse['valid']);
 
-        $this->assertEquals('The value of attribute "firstname" must be set', $validationResponse['messages'][0]);
-        $this->assertEquals('The value of attribute "lastname" must be set', $validationResponse['messages'][1]);
+        $this->assertEquals('The value of attribute "First Name" must be set', $validationResponse['messages'][0]);
+        $this->assertEquals('The value of attribute "Last Name" must be set', $validationResponse['messages'][1]);
     }
 
     public function testIsReadonly()

dev/tests/integration/testsuite/Magento/Catalog/Controller/Adminhtml/CategoryTest.php

@@ -339,7 +339,7 @@ public function testSaveActionCategoryWithDangerRequest()
         );
         $this->dispatch('backend/catalog/category/save');
         $this->assertSessionMessages(
-            $this->equalTo(['The value of attribute "name" must be set']),
+            $this->equalTo(['The value of attribute "Name" must be set']),
             \Magento\Framework\Message\MessageInterface::TYPE_ERROR
         );
     }