Template improvements.

- motion detail template: Fixes motion manage state template block.
- mediafile list template: Fixed missing activeline class.
- item detail template: Fixed is_active_slide conditions.
- assignment view template: Use bottongroup instead of single radio buttons.
- Projector template: Updated header and countdown style. Removed footer.
- Added config options to show logo and/or title/description.
- Projector template: New config options to set background color and font color for projector header.
- Make WLAN form labels not translateable.
Merge pull request #1019 from emanuelschuetze/several-1.5-fixes

Template improvements and translation strings