erp5_hal_json_style: return icon in order to be possible to define action's icon

bt5/erp5_hal_json_style/SkinTemplateItem/portal_skins/erp5_hal_json_style/ERP5Document_getHateoas.py

@@ -790,6 +790,7 @@ def calculateHateoas(is_portal=None, is_site_root=None, traversed_document=None,
         erp5_action_list.append({
           'href': '%s' % view_action['url'],
           'name': view_action['id'],
+          'icon': view_action['icon'],
           'title': Base_translateString(view_action['title'])
         })
         # Try to embed the form in the result