ENGCOM-2477: [Backport] Newsletter Label is broking on chinese Language like 订阅. #17022

 - Merge Pull Request #17022 from dasharath-wagento/magento2:2.1-develop-PR-port-13029
 - Merged commits:
   1. aad8cb7

Author: magento-engcom-team

app/design/frontend/Magento/luma/Magento_Newsletter/web/css/source/_module.less

@@ -67,6 +67,7 @@
             border-bottom-left-radius: 0;
             border-top-left-radius: 0;
             margin-left: -1px;
+            white-space: nowrap;
         }
     }
 }