APP2SD: custom strings

Change-Id: I3d31f58b5a2cfa7b679e131748cda48cf8f47a0a
Enable moving applications to an external volume

* Always enable moving applications to an external volume if it is
  available and mounted

Change-Id: Ia683eda30338dfad0d7e78087d42d7e512fa83e4
Settings: add app moving menu options

Settings > Apps > Menu

Thanx to chenxiaolong.

Change-Id: I08f5323f4bfd4f0d56fc2f840bad90beb95cb9ac
Signed-off-by: Shubhang Rathore <shubhang92@gmail.com>