[FIX] account: Create reversal reference using partner's language

Steps to reproduce:
====================
- Create an invoice
- Add a customer whose language differs from the user's language
- Create a reversal
- Print the PDF

Problem:
=========
The reversal reference is generated using the user's language,
making it impossible to translate properly because the string value
is changed and concatenated with the invoice name.

Solution:
==========
Generate the reversal reference using the partner's
language to enable proper translation.

opw-4743430

closes odoo#216458

X-original-commit: 3b65dd9
Signed-off-by: Antoine Boonen (aboo) <[email protected]>
Signed-off-by: Saif Allah Ben Khalil (sben) <[email protected]>

Author: sben-odoo

addons/account/wizard/account_move_reversal.py

@@ -90,10 +90,11 @@ def _compute_from_moves(self):
     def _prepare_default_reversal(self, move):
         reverse_date = self.date
         mixed_payment_term = move.invoice_payment_term_id.id if move.invoice_payment_term_id.early_pay_discount_computation == 'mixed' else None
+        lang = move.partner_id.lang or self.env.lang
         return {
-            'ref': _('Reversal of: %(move_name)s, %(reason)s', move_name=move.name, reason=self.reason)
+            'ref': self.with_context(lang=lang).env._('Reversal of: %(move_name)s, %(reason)s', move_name=move.name, reason=self.reason)
                    if self.reason
-                   else _('Reversal of: %s', move.name),
+                   else self.with_context(lang=lang).env._('Reversal of: %s', move.name),
             'date': reverse_date,
             'invoice_date_due': reverse_date,
             'invoice_date': move.is_invoice(include_receipts=True) and (self.date or move.date) or False,