Put our link to all mails and sync the formatting

src/mail_templates/out_of_disk_space.ejs

@@ -1,19 +1,20 @@
 <%if (format === 'text') { %>
 
-Dear Cloudron Team,
+Dear Cloudron Admin,
 
 <%= fqdn %> is running out of disk space.
 
 Disk space logs are attached.
 
-Thank you,
-Your Cloudron
-
 -------------------------------------
 
 <%- message %>
 
+-------------------------------------
+
+
+Powered by https://cloudron.io
+
 <% } else { %>
 
 <% } %>
-