[MERGE] forward port branch 12.0 up to 9c742d0c

addons/account/models/account_invoice.py

addons/account/models/partner.py

addons/account/report/account_aged_partner_balance.py

addons/account/wizard/account_invoice_send_views.xml

addons/account_voucher/models/account_voucher.py

addons/google_account/models/google_service.py

addons/hr_holidays/report/hr_holidays_reports.xml

addons/hw_escpos/controllers/main.py

addons/l10n_fr_fec/wizard/account_fr_fec.py

addons/mail/models/mail_template.py

addons/point_of_sale/static/src/js/models.js

addons/point_of_sale/wizard/pos_payment.py

addons/pos_mercury/__manifest__.py

addons/pos_mercury/static/src/js/pos_mercury.js

addons/pos_mercury/views/pos_config_views.xml

addons/purchase_stock/models/stock.py

addons/purchase_stock/tests/test_stockvaluation.py

addons/web_editor/static/src/js/wysiwyg/widgets/media.js

addons/web_editor/static/src/xml/wysiwyg.xml

addons/website/models/__init__.py