Merge remote-tracking branch 'odoo/14.0' into 14.0

addons/l10n_de/report/din5008_report.xml

addons/l10n_de/static/src/scss/report_din5008.scss

addons/mass_mailing/models/mailing.py

addons/mrp/wizard/mrp_immediate_production_views.xml

addons/stock/models/product.py

addons/test_mass_mailing/models/mailing_models.py

addons/test_mass_mailing/security/ir.model.access.csv

addons/test_mass_mailing/tests/test_mailing.py