Fixed a small bug when using i18n
Set order as activated when all devices are so.

Now when activating a device we check if all the
others from the same order are as well, and in that
case we set the order as activated if it isn't so.
Battery level barriers are now configurable

By default we have set them at 20 and 50.
Moved position saving logic to animal_service
Notifications for battery and inactive devices

Now we use the notification system for making the
user know about decreases in battery levels and
on gps updates for inactive devices.
Also added a notification for duplicated gps updates
(for the same instant), though this should never
happen.
Added notification for immobile animals

Now we can configure a max time for an animal
to send the same position before notifying
the user about it.