Feature #5157 :
- fixing a CRUD display when createDate and lastUpdateDate dates of a media are equals
- adding the sound notion into gallery application descriptions
- fixing the management of default download value
- fixing the date manipulation around visibility and download filters
- fixing youtube streaming share URL that were not taken into account
- fixing the download link visibility according to privileged users
- fixing a JQuery UI dialog that was displayed behind video or streaming containers (view media page and delete action)