Merge pull request #82 from oerpub/image-plugin-warning-icon

Image plugin warning icon and styling
Merge pull request #83 from oerpub/57058562-improve-type-switcher

Improve styling of type/label switcher
Merge pull request #86 from oerpub/58715066-prevent-link-wrap

prevent link popover from always wrapping
change default position of "description missing" message

For now, just always have it on the left so that it isn't "missing" on
big images.
move "thank you" msg styling from JS to CSS

The white background being set in JS was persisting even if one removed
the alt value.
Merge branch 'refs/heads/58639196-alt-warning-positioning' into testing