Fix crashes in crash notification mail

src/mail_templates/crash_notification.ejs

@@ -2,7 +2,7 @@
 
 Dear Cloudron Team,
 
-unfortunately the '<%= program %>' crashed unexpectedly on <%= app.fqdn %>!
+unfortunately the <%= program %> on <%= fqdn %> crashed unexpectedly!
 
 Please see some excerpt of the logs below.
 

src/mailer.js

@@ -275,7 +275,7 @@ function sendCrashNotification(program, context) {
     var mailOptions = {
         from: config.get('mailUsername'),
         to: 'admin@cloudron.io',
-        subject: util.format('[%] %s has crashed', config.fqdn(), program),
+        subject: util.format('[%s] %s exited unexpectedly', config.fqdn(), program),
         text: render('crash_notification.ejs', { fqdn: config.fqdn(), program: program, context: context, format: 'text' })
     };