Fixes #2232 - speed up Host view via AJAX

I split off the heavy queries to AJAX loading so that the host view is presented while the server is still looking up various details.
Looking at this again, these messages aren't displayed to the user but rather passed to the logger. Since none of the logger messages are translated, these shouldn't be as well. The message displayed to the user in case of a server error is the message passed on the exception.