After the core Dialog API was refactored in [1], the web_editor and website dialogs had to be reworked. These dialogs are using a base WebsiteDialog component, that allows for a default footer and adds the o_website_dialog content class. [1]: https://github.com/odoo/odoo/commit/7c4f200b8edf0bc695c623c7afc62288f838db36 See merge commit for more information. task-2687506