Switched wording of placeholders and labels
Various enhacements for displaying flashcard questions
Added (ugly) show/hide flashcard button
Display feedback smiley on 'live feedback' button's badge
Decided to merge branch 'delfi'
Better short names; FC support for showcase; fixed indicator bug
Switched around statistics button and question counter

I decided to leave the student's question panel unchanged because
the statistics button is not always present. This would lead to
even more "jumping" visuals when the button is displayed on one
card, but hidden on the next card.
One more missing flashcard text...