Merge pull request #35 from Decio1/it-translation

First draft for italian translation.
added new German tranaslation, thanks to @ChristianTanner
new Constant for tethering settings
accounting per-app network usage
new string
moved string to no_translation in order to avoid code repetitions
new method in order to get network status — not tested yet
new receiver: get network changes in order to trigger tethering support activation — needs some more work
some more tests with tethering support — most probably the MASQUERADE thing in nat table, POSTROUTING chain, is creating problems
enables only if tethering support is checked in orwall prefs
corrected typo
uses constant name instead of hard-coded value
better constant name
removed useless variable
better debug entry
added missing escapes
Corrected tethering detection

it's really ugly. But it works. And there's NO other API call we can
make in order to know if we're using tethering or not. Thanks Android
for such a lame way to provide this information :(
upgraded Studio
deactivated network receiver for now: not working as expected
bump version