[IMP] website_forum: add plugin in editor for code management + karma check for editor options

- Task: https://www.odoo.com/web?debug=#id=8712&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.Mo2LPzffbGk1mjxD
Is it really necessary to use SUPERUSER_ID here ? I don't think so, if there are issues, probably some access rights need fixing.