Correct incorrect uses of "weight" and "weighting"

Also made some other edits to back-end versus back end
Back end is the thing, and back-end is the adjective

Closes-Bug: #1335423

Change-Id: I09fcf289788630b6f016aa5ee373068401c762cf
Author: Diane Fleming dfleming@austin.rr.com
Merge "Correct incorrect uses of "weight" and "weighting""