Make "VLAN", "VXLAN" and "GRE" translatable

VLAN has been translated in other places.  Use the translation in
create network and make sure all 3 are translatable.

Change-Id: I2263d1ceef1e4aa6fe1c324e0a9ad5a66fa1d714
Closes-bug: #1381679
Merge "Make "VLAN", "VXLAN" and "GRE" translatable"