Add missing mockup files.
Replace CSS with copy from mockup. Part of T5 and other tasks.
Implement T5: Infopanelet

* New CSS, from previous commit
* Rename 'artist' => 'kunstner/produsent'
* Rename 'tittel' => 'tittel/betegnelse'
* Add ref_literature
* Add origin_provenience
* Add item_number
* Convert linebreaks to <br />