Settings: Rename 'Power sounds' to 'Charging sounds' and add summary

Change-Id: I1cb872917e2d03f0a1c77c25c27f2a0496f9bc05
Settings: Fix Slovak aapt warnings

Change-Id: I3c41b782ce4f8bc1ecc4895709b9251b9857da2d
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge "Settings: Fix Slovak aapt warnings" into cm-10.1
Merge remote-tracking branch 'cm/cm-10.1' into cm-10.1