Odoo Release Updates

[IMP] account_online_payment: send email on webhook and add tests

[FIX] html_editor: fix references and lint errors

[FIX] l10n_{be, nl}_reports: Improve VAT payment instruction layout

[IMP] knowledge: Promen-ad-ulation

[FIX] website: restore background colors for translator indicators

[FIX] spreadsheet_sale_management : unlink spreadsheet when so template is changed

[IMP] account_peppol: add peppol_metadata

[FIX] sms_twilio: fix failure types support on notifications / traces

[FIX] account: warning on currency decimal change independent of entries

[FIX] spreadsheet: display value for id fields in pivots