Editor tool should hide UUID of resources and display labels/titles instead

[rtroncy]

When looking for a video to load in the editor tool from the AVRO content provider, http://editortool.linkedtv.eu/avro/, one can see a list of UUID of media resources. The UI should hide as much as possible id and URI and display instead the labels of the corresponding resources. In this case, a media resource has a title that should be displayed