fix(content): Extend list view with new data

SD-952
feat(content): Add metadata in content preview

SD-946
feat(metadata): display metadata

in right pane preview
in lightbox preview

SD-946
fix (users):  Fixes add avatar from URL, avatar update for current logged user and enable/disable user

Fixes:
SD-1020: Changing the status of user from enabled to disabled leads to
displacement of newly uploaded avatar image
SD-920: Issue when trying to enable unsaved user
SD-278 : As user I want to be able to set an avatar with an image by
using an external link
SD-376 : Avatar does not update in the right corner (even after cache
clean)