Original issue: http://jira.joubel.com/browse/HVP-146
Improve the UX of the DnD editor. User tests have shown that the DnD editor is next to unusable for beginners. The single biggest problem users are having, is assigning draggables to dropzones and vice versa. Documentation from user tests: https://drive.google.com/a/joubel.com/folderview?id=0B4y9EjrtvlJidm9la0FHWTlNT0k&usp=sharing
1. Allow authors to add an optional task description (instruction text)
2. Do not show task title in end user view (typically "Drag and Drop"), but show the task description from 1. instead. If no task description has been added, show nothing.
3. Reduce font-size of the text above the bakcground image (currently the task title). Make font-size consistent with other H5P Questions (1.125em).
4. Hide the horizontal grey line (which separates the task area from the feedback section) when a background image is present. The line is redundant when there is a background image.