Add fields in the document form to edit each property of the data JSON field

[frederic-reis]

Part of the Visual Editor Document Management project.

Task:

• [x] Update the document form template to load an external javascript library
• [x] Load the JSON schema with jQuery
• [x] Generate the dynamic form from the schema properties
• [x] Implement multilingual fields
• [x] Implement a drop-down list for fields of type boolean and fields with the enum property defined
• [x] Update the data JSON field simultaneously
• [x] Implement a validation for required fields
• [x] Implement a validation in a numeric format for integer fields
• [x] Implement a validation in a specified format for date fields
• [x] Set the data JSON field read-only