Fix mismatched markup in Settings strings.

Revert "Revert "Settings strings cleanup per standards.""

Bugs: 5165745, 5163232, 5162668, 5162667, 5162328

Implementation of language and spelling changes requested by Design
such as WiFi. Also removed some dialog titles per Design.
Will file separate bug to have the titles removed properly;
for now I just made the string empty.

This reverts commit e2db5875.

Change-Id: I0f865d1441d990e5e63f2a257a27ae521220af14