Revamp of the accessibility settings.

1. Reimplemented accessibility settings accrding to UX design.

NOTE: The strings are not final, rather reasonable placeholders
   to avoid blocking on them. Will submit another CL with string
   updates and any necessary polishes.

bug:5065409

Change-Id: I3ba229a624298dbf238bc8562b42616b386f8c34
7 files changed