Issue #3481076: unknown-error code hides actual error message from Google

Closes #3481076

Add original error received from google when no matching code is found.

recaptcha.module

@@ -236,9 +236,11 @@ function recaptcha_captcha_validation($solution, $response, $element, $form_stat
       }
       else {
         if (!isset($error_codes[$code])) {
-          $code = 'unknown-error';
+          \Drupal::logger('reCAPTCHA web service')->error('@error', ['@error' => $error_codes['unknown-error'] . ' Original error: ' . $code]);
+        }
+        else {
+          \Drupal::logger('reCAPTCHA web service')->error('@error', ['@error' => $error_codes[$code]]);
         }
-        \Drupal::logger('reCAPTCHA web service')->error('@error', ['@error' => $error_codes[$code]]);
       }
     }
   }