Enable Ethernet tab in data usage

mStateSession is not initialized at the time hasEthernet is called to
set mShowEthernet, so Ethernet tab is not shown at the startup.
In this case, if the device doesn't support mobile network, user cannot
even select it from the context menu.

Bug: 8365419
Change-Id: I441971f18346c34a3adf3f18d9355075d9dce3f0
Signed-off-by: Jaewan Kim<jaewan@google.com>
Updated simplified Chinese translations

Change-Id: I0bf2cef754401c4001f91aecc04aa8b408ce3964
Updated simplified Chinese translations

Change-Id: I11ad4eba234a9d3e25750424893225b4fd7c5e0b
Update Japanese translation

- Modify translation a little

Change-Id: I2cbc0e3af022de74fb6b6021464325dd33af9ecb
Signed-off-by: rdgate <rdgate@gmail.com>