Remove underscores and html strings from add image details view

[tonisevener]

Phabricator: https://phabricator.wikimedia.org/T363944

Notes

Removes underscores and html tags from image information before showing "Add image details" view. Also ensure the image description is displayed from the editor flow.

Test Steps

1. Go to "Add image details" view in recommendations flow.
2. Confirm image title and description does not show underscores or html tags.
3. From editor flow, tap image wizard. Tap through until you reach the "Media settings" view. Confirm image description shows beneath image url.