Put our link to all mails and sync the formatting

src/mail_templates/app_down.ejs

@@ -1,17 +1,19 @@
 <%if (format === 'text') { %>
 
-Dear Admin,
+Dear Cloudron Admin,
 
 The application '<%= title %>' installed at <%= appFqdn %> is not responding.
 
 This is most likely a problem in the application.
 
-You are receiving this email because you are an Admin of the Cloudron at <%= fqdn %>.
+To resolve this, you can try the following:
+* restart the app in the app configuration dialog
+* restore the app to the latest backup
+* contact us via support@cloudron.io or https://chat.cloudron.io
 
-Thank you,
-Application WatchDog
+
+Powered by https://cloudron.io
 
 <% } else { %>
 
 <% } %>
-