This update removes and consolidates custom styling used across several kanban views, making screens more consistent and easier to maintain. Users should see a more uniform visual experience in areas like CRM, HR, recruitment, gamification, fleet, mass mailing, and projects, with no expected change to core workflows.

- Task: https://www.odoo.com/web#id=8367&view_type=form&model=project.task&menu_id=3942&action=327
- Pad: https://pad.odoo.com/p/r.yL5gHFj7mUTj6Fb5

The web interface now uses a newer Bootstrap-based date and time picker instead of the older jQuery UI component. This fixes issues with date fields not opening correctly and improves language support by aligning the picker locale with the server settings.

Remove jquery-ui-datetimepicker library and change with a bootstrap one
Also include moment.js library (needed by the new library)