Update CurrencyConverterApi.php

Author: swnsma

app/code/Magento/Directory/Model/Currency/Import/CurrencyConverterApi.php

@@ -103,7 +103,7 @@ private function convertBatch($data, $currencyFrom, $currenciesTo)
                         $data[$currencyFrom][$to] = null;
                     } else {
                         if (isset($response['error']) && $response['error']) {
-                            $this->_messages[] = __($response['error']);
+                            $this->_messages[] = $response['error'];
                             $data[$currencyFrom][$to] = null;
                         } else {
                             $data[$currencyFrom][$to] = $this->_numberFormat(