SystemUI: ES translations

When Bluetooth is off the tile in quick settings shos "BLUETOOTH DESACTIVADO".
That'a a long string that doesn't fit the tile.

Change-Id: I0cd6130debc9f43bcd0c2a29525d0e12a15bc9c3
TRDS: Fix Volume panel background

Volume panel is a bit out of the box compared to the normal theming.
Reapply the background via java code on theme change.

Change-Id: I0df41a95487f7c23d5fda5c2ec7df763c8e2f466
Please follow slim guidelines

3 patches put new custom symbols into the aosp symbols.xml

Our guidelines say that we put all changes which differ from aosp
into slim_symbols.xml

Change-Id: I3b8c2e5b079cefe53e0ec85b74446d5d157b069f