Choose to display the label with directory in drop-down list in data table

When displaying a drop-down list of a directory, one should use label instead of id to display to users.

A sample bundle is attached to the ticket

• deploy it on a hotfixed 10.10 instance
• create a Note and edit its metadata
  => The bundle displays a data form (cf nxserver\nuxeo.war\ui\document\note\nuxeo-note-edit-layout.html in the instance)
• add an entry => the id of the directory entry (the first field) is displayed instead of the label during edition => save => the label is then used OK.
• edit the entered metadata => If wishing to change the directory entry, the id of the directory is displayed instead of the label.=> save => the label is then used OK.

The problem is the display of the id instead of the label in the drop-down form and the request is to change this behavior.