Missing icons for image editing

[tmkarlsen]

**Icons and view for image editing must be fixed **
The icons and view for editing images within H5P must be fixed.

Screenshot

vs

[tmkarlsen]

Is is unclear what's causing this. Estimate is therefore 2 days.

[chrieinv]

The reason is that NDLA loads some custom scripts, one of these is the h5peditor-image-pop.js that loads the image editor. This uses a custom style that is not loaded in the editor iframe