[ADD] license and copyright everywhere

models/acc_operation.py

-# Copyright 2023 Le Filament (<http://www.le-filament.com>)
-# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-
+# Copyright 2021- Le Filament (https://le-filament.com)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)
 from datetime import datetime, time
 
 from dateutil.relativedelta import relativedelta

views/acc_operation_views.xml

 <?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2021- Le Filament (https://le-filament.com)
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
 <odoo>
 
     <record id="acc_operation_form_view" model="ir.ui.view">