[ADD] l10n_ar: generic changes to use in QR code

AFIP give us new resolution 4291 that request to print QR code in
printed version of electronic invoices. For that we:

1) update the xml report footer style
2) add generic method to sanitze the identification number we are
sending, the sanitize method is added here in order to be re used for
other functionalities across electronic invoice and reports. If we are
not able to sanitize the number then we show an error to the user
3) update translations to add new raise message translated term

NOTE: Fix pylint errors: This ones pop up when running this PR "Check Style'
in runbot

closes odoo/odoo#65034

Related: odoo/enterprise#15949
Signed-off-by: Josse Colpaert <jco@openerp.com>