[CRM] onboarding fixes and improvements after user testing

- Task: https://www.odoo.com/web#id=9657&view_type=form&model=project.task&action=333&active_id=248
- Pad: https://pad.odoo.com/p/r.kUSVNAuFbAMb5yqr
Yes, i think i have never heard it, and google translate don't recognize it.