TorStatusBeta, Improve error messages and make clear which data will be accepted

Trac has so less space, so I wrote it down on pastebin. (Yes I can resize the input field)

http://pastebin.com/6Fv1g3uL

For instance tell that JavaScript is required and that the data source has to be unblocked.

It's more a list what I saw, nothing to worry about.