Issue #8746 by turegjorup: Fixed Doctrine mapping for Media entity. Corrected Annotations to XML. Added "in use" check to delete for media
Merge branch 'development' of github.com:Indholdskanalen/indholdskanalen into development

# By Troels Ugilt Jensen
# Via Troels Ugilt Jensen
* 'development' of github.com:Indholdskanalen/indholdskanalen:
  Corrected text.
  Issue #8782 by tuj: Fixed texts for screen creation.
  Issue #8782 by tuj: Fixed texts for slide creation.
  Issue #8782 by tuj: Fixed texts for channel creation.
  Issue #8782 by tuj: Removed conditionally showing what the different steps in creation procedures is.