Give a useful representation for debugging
Handle failed requests

This gets rid of a build-up of already failed requests.
Set proxy to empty for direct connection

Fixes the problem that localTM wasn't working with direct connection.
Set a short timeout for TM requests
Hide the main window as soon as possible on quit

This way the gui might seem more responsive if it takes a while to
shutdown (there is some writing of config files, for example).
Remove unused code
Bind the gettext domain in libintl on Windows

This fixes i18n for gtk Builder for the Windows package.