Add Quick Settings USB Tether tile (2 of 2)

Patch Set 8: Make tile dynamic

- Thanks to Björn Lundén for the drawables

Change-Id: I414848f6cb8a789d0b5edfcb79ab53cb85ebc20e
es_ES: Added spanish translations

Change-Id: Id6e9f26cc9425a1d187e468d4d4f5a4b0a0bac3e