GPII-722: Fixing problem with blank sentences.
NVDA reads a lot of blank sentences that confuse the user.
GPII-722: Hide message line after logout.
Merge branch 'master' into GPII-722

Conflicts:
	src/pmt/pmt-VisualAlternativesGroupContainer.html
	src/shared/adjusters/css/adjusters.css
	src/shared/adjusters/html/LanguageGroupContainer.html
	src/shared/adjusters/html/VolumeGroupContainer.html
GPII-722: Merging dimokas' GPII-722 work with the exception of the *.svg files and the font/OpenSans-LICENSE.txt file that for some reason registers as changed according to github
Merge https://github.com/GPII/prefsEditors into gpii-752