various notification fixes

src/mail_templates/app_down-text.ejs

@@ -1,5 +1,3 @@
-<%if (format === 'text') { %>
-
 Dear Cloudron Admin,
 
 The application '<%= title %>' installed at <%= appFqdn %> is not responding.
@@ -8,8 +6,9 @@ This is most likely a problem in the application.
 
 To resolve this, you can try the following:
 
+* Check the app logs - https://docs.cloudron.io/apps/#log-viewer
 * Restart the app by opening the app's web terminal - https://docs.cloudron.io/apps/#web-terminal
-* Restore the app to the latest backup - https://docs.cloudron.io/backups/#restoring-an-app
+* Check the troubleshooting guidelines - https://docs.cloudron.io/troubleshooting/#unresponsive-app
 * Contact us in our Forum at https://forum.cloudron.io
 
 Powered by https://cloudron.io
@@ -18,6 +17,3 @@ Don't want such mails? Change your notification preferences at <%= notifications
 
 Sent at: <%= new Date().toUTCString() %>
 
-<% } else { %>
-
-<% } %>

src/mail_templates/app_up-text.ejs

@@ -0,0 +1,11 @@
+Dear Cloudron Admin,
+
+The application '<%= title %>' installed at <%= appFqdn %> is back online
+and responding to health checks.
+
+Powered by https://cloudron.io
+
+Don't want such mails? Change your notification preferences at <%= notificationsUrl %>
+
+Sent at: <%= new Date().toUTCString() %>
+

src/mail_templates/backup_failed-text.ejs

@@ -1,5 +1,3 @@
-<%if (format === 'text') { %>
-
 Dear <%= cloudronName %> Admin,
 
 Cloudron failed to create a complete backup. Please see the logs at <%= logUrl %> for more information.
@@ -17,7 +15,3 @@ Don't want such mails? Change your notification preferences at <%= notifications
 
 Sent at: <%= new Date().toUTCString() %>
 
-
-<% } else { %>
-
-<% } %>

src/mail_templates/certificate_renewal_error-text.ejs

@@ -1,5 +1,3 @@
-<%if (format === 'text') { %>
-
 Dear Cloudron Admin,
 
 The certificate for <%= domain %> could not be renewed.
@@ -27,6 +25,3 @@ Don't want such mails? Change your notification preferences at <%= notifications
 
 Sent at: <%= new Date().toUTCString() %>
 
-<% } else { %>
-
-<% } %>

src/mail_templates/oom_event-text.ejs

@@ -1,5 +1,3 @@
-<%if (format === 'text') { %>
-
 Dear <%= cloudronName %> Admin,
 
 <%if (app) { %>
@@ -24,6 +22,3 @@ Don't want such mails? Change your notification preferences at <%= notifications
 
 Sent at: <%= new Date().toUTCString() %>
 
-<% } else { %>
-
-<% } %>