fix(dashboard): update email notification

Author: ysfscream

src/i18n/Dashboard.js

@@ -237,7 +237,7 @@ export default {
   },
   beforeTheCertificateExpires: {
     zh: '证书到期前 EMQ 将通过邮件通知签发邮箱，请留意信息接收以免错过续期时间对业务造成影响。',
-    en: 'EMQ will email notification before the license expires. Please pay attention to the contact email inbox.',
+    en: 'EMQ will send license expiration reminder by email. Please pay attention to the contact email inbox.',
   },
   forTrialEdition: {
     zh: '当前 License 为试用版',