Show better placeholder when Dashboard server sends HTTP error

This morning the Dashboard server returned a 503 http status error. Unlike the page shown when there is no connection at all this page does not provide a refresh link.

Suggestion

When the server returns anything else then 200, we might use the offline page (and insert the actual status error there).

Since users might not even understand the Dashboard runs on a server, we might look into the wording for the offline page as well, e.g.

Could not connect to the Appcelerator Platform
Please try again later.

(status: 503)