GPII-167: Added aria-label to sliding panel button and message stringsfor this attrib
Merge branch 'master' into GPII-167

Conflicts:
	demos/discoveryTool/demo.js
GPII-167: Merged in master and gpii-128, fixed options update
Merge remote-tracking branch 'heidi/GPII-167'

* heidi/GPII-167:
  GPII-167: Added aria-label to sliding panel button and message stringsfor this attrib