Issue #8729 by turegjorup: Fixed local path to file being set incorrectly on callback from Zencoder
Merge branch 'development' of github.com:Indholdskanalen/indholdskanalen into development

# By Jesper Kristensen (6) and Troels Ugilt Jensen (2)
# Via Jesper Kristensen (2) and Troels Ugilt Jensen (1)
* 'development' of github.com:Indholdskanalen/indholdskanalen:
  Issue #8746 by cableman: Ensured that media order is updated when slide is deleted
  Issue #8743 by cableman: Updated coding style for slide controller
  Issue #8743 by cableman: Added delete link to screens
  Issue #8743 by cableman: Fixed spell error in slide directive
  Issue #8743 by cableman: Added delete link to slides
  Issue #8743 by cableman: Added delete directive to channels
  Issur #8707 by tuj: Updated documentation
  Added checks for existance