Splaspage: Add highlights. Fix cfp inclusion.

https://github.com/openSUSE/osem/issues/544
https://github.com/openSUSE/osem/issues/545

@hennevogel perhaps some ideas for styling? :)
@hennevogel @differentreality 
Why do we update each attribute individually?
Doesn't it make more sense to simply do 
```
@event.update_attributes(event_attributes)
```
Or something in this way? Updating each attribute individually just bloats the controller up...