Implement transcoding message for videos

Currently is showing an error loading the thumbs for videos that are being transcoding

added 1 deleted label

added TypeFeature label

added PlatformMobile label

added 1 deleted label

changed milestone to %Mobile 3.12

changed weight to 1

changed the description

assigned to @juanmsolaro

added StatusInProgress label

mentioned in merge request !415 (merged)

added StatusReview label and removed StatusInProgress label

changed time estimate to 3h

added 3h of time spent at 2019-11-19

closed