Taxes have a `description` field that has been hijacked to
represent tax label on invoices. We want the description field
to be used for its original purpose, thus created a dedicated field
`invoice_label` in which we transferred `description` content.
We also make description translatable.
This is part of the Tax Taxonomy 2 rework.
Task: 3052677
Part-of: odoo/odoo#113236