Revert "api validation localhost error message : display only if localhost"

This reverts commit 4992b65f14.

lib/API/JSON/v1/Services.php

@@ -66,13 +66,8 @@ class Services extends APIEndpoint {
         break;
       default:
         $code = !empty($result['code']) ? $result['code'] : Bridge::CHECK_ERROR_UNKNOWN;
-        $errorMessage = __('Error validating MailPoet Sending Service key, please try again later (%s).', 'mailpoet');
-        // If site runs on localhost
-        if( 1 === preg_match("/^(http|https)\:\/\/(localhost|127\.0\.0\.1)/", site_url()) ) {
-          $errorMessage .= ' ' . __("Note that it doesn't work on localhost.", 'mailpoet');
-        }
         $error = sprintf(
-          $errorMessage,
+          __("Error validating MailPoet Sending Service key, please try again later (%s). Note that it doesn't work on localhost.", 'mailpoet'),
           $this->getErrorDescriptionByCode($code)
         );
         break;