⏫ Forwardport of #13041 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/13041.patch (created by @monaemipro) based on commit(s):
  1. d9536c8

Fixed GitHub Issues in 2.3-develop branch:
  - #12320: Newsletter subscribe button title wrapped (reported by @Gvigner)

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;
         }
     }
 }