Revert "Fix: Correct string reference error"

This reverts commit 246a3c8fd39075ba8b3ccae4a5bce2236915619f.
Revert "Spanish translations for disable safe headset volume"

This reverts commit b0c20a6de83b1ceb5f6ca02379a331aa1787ea29.
Revert "enhancements to Disable safe headset volume warning"

This reverts commit 05615e09c575aa8ac4948b43369730f77d60008c.
Revert "[1/2] Base: Disable safe headset volume warning"

This reverts commit 83bdebe0575b40e55ddf9928081235eda7e8b531.
Disable safe headset volume warning

In some countries, regulations require that a warning be displayed
when the media volume is being raised above recommended level while
using a headset. As this is regulation we don't simply remove the
warning, but instead give the user the option to disable it.

In this implementation, the user is presented with the warning at
least once, at which point they are given the option to disable it
completely (via on-the-spot preference).

PS1: initial commit
PS2: update to reflect changes to https://gerrit.paranoidandroid.co/#/c/3702/
PS3: add new drawable (thanks Arz....finally)

Change-Id: Ib29ddb7f0ed5b1d45ed56d13bd6f7e14d005da79

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/pa_strings.xml
	core/res/res/values/pa_symbols.xml
	media/java/android/media/AudioService.java
	packages/SystemUI/res/values/pa_strings.xml
Spanish translations

Change-Id: I82918b674d0289cb37c8aa83d45c9fe9e456a9c5