Internationalize hostels package.
Remove exception catcher in switchReservations and corresponding test.
When testing the hostel configuration manually I found out that the beds_reserved list attribute of halls
only changed during the lifetime of a running instance. After restarting the portal all changes were gone.
Also "hostel._p_changed = True" didn't help. The only solution was to reassign the attribute to ensure persistance.
Unfortunately, the current tests don't catch such a malfunction. This has to be improved.