Task #16442

Conflicts:
	src/main/webapp/app/controller/Questions.js
	src/main/webapp/app/internationalization.js

Conflicts:
	pom.xml

The loading mask has been replaced with a loading indicator. On devices
or browser windows with a screen width < 720px the loading indicator
will be rendered above the tabbar at left bottom position. Otherwise it
will appear left aligned inside the tabbar.