Before this commit, There is no way to see the next lesson of attendee. After this commit, User/Manager can see the next lesson from backend. Also added 'is_published' field into course's tree view. Added search for responsible, tag and content, also added 'Archived' filter. Task-2199207 closes odoo/odoo#79119 Signed-off-by: Warnon Aurélien (awa) <awa@odoo.com>