[FIX] account: tax amount on invoice document

- Install French language
- Set language of Customer A to French
- Create an invoice for A (some tax must be applied)
- Print the invoice

The tax amount below 'Subtotal' is not formatted in French.

`t-esc` does make use of the `t-lang` option, so when the expression is
evaluated, the lang is not in the context. We do not change this
behavior since it can have a major impact.

opw-782118

addons/account/models/account_invoice.py

@@ -1159,7 +1159,9 @@ class AccountInvoice(models.Model):
             res.setdefault(line.tax_id.tax_group_id, 0.0)
             res[line.tax_id.tax_group_id] += line.amount
         res = sorted(res.items(), key=lambda l: l[0].sequence)
-        res = map(lambda l: (l[0].name, l[1]), res)
+        res = [(
+            r[0].name, r[1], formatLang(self.with_context(lang=self.partner_id.lang).env, r[1], currency_obj=currency)
+        ) for r in res]
         return res
 
 

addons/account/views/report_invoice.xml

@@ -104,7 +104,7 @@
                             <tr>
                                 <td><span t-esc="amount_by_group[0] if len(o.tax_line_ids) > 1 else (o.tax_line_ids.tax_id.description or o.tax_line_ids.tax_id.name)"/></td>
                                 <td class="text-right">
-                                    <span t-esc="amount_by_group[1]" t-options='{"widget": "monetary", "display_currency": o.currency_id}'/>
+                                    <span t-esc="amount_by_group[2]"/>
                                 </td>
                             </tr>
                         </t>