[MERGE] foward port of 10.0 up to revision 84a650e3

CONTRIBUTING.md

addons/account/i18n/account.pot

addons/account/models/account.py

addons/account/models/account_invoice.py

addons/account/models/account_move.py

addons/account/models/account_payment.py

addons/account/models/partner.py

addons/account/report/account_overdue_report.py

addons/account/views/report_invoice.xml

addons/account/wizard/account_invoice_refund.py

...count_analytic_default/models/account_analytic_default.py

addons/account_asset/report/account_asset_report.py

addons/account_test/report/report_account_test.py

addons/anonymization/wizard/anonymize_wizard.py

addons/calendar/models/calendar.py

addons/crm/i18n/crm.pot

addons/crm/static/src/js/web_planner_crm.js

addons/event/views/event_views.xml

addons/event_sale/models/sale_order.py

addons/gamification/models/challenge.py