[FIX] sale: use partner's lang on creating invoices

This commit adds lang context on preparing invoice lines. Othwerwise we may get
lines in user's lang instead of partner lang.

For example, it's needed in sale_subscription module:

https://github.com/odoo/enterprise/blob/e5e168d596aaefcd842fc553890e474aff3322f2/sale_subscription/models/sale_order_line.py#L235-L236
https://github.com/odoo/enterprise/blob/e5e168d596aaefcd842fc553890e474aff3322f2/sale_subscription/models/sale_order_line.py#L262

STEPS:

- Use English as your user language
- Set a language different from English on a customer C
- Create a subscription product P
- Create a SO for C with P
- Create the invoice

opw-3104785

closes odoo/odoo#110152

X-original-commit: 6dee103df5e5f64d8edf871d4e1a284ef4d21725
Signed-off-by: Ivan Elizaryev (iel) <iel@odoo.com>

addons/sale/models/sale_order.py

@@ -1078,7 +1078,7 @@ class SaleOrder(models.Model):
         invoice_vals_list = []
         invoice_item_sequence = 0 # Incremental sequencing to keep the lines order on the invoice.
         for order in self:
-            order = order.with_company(order.company_id)
+            order = order.with_company(order.company_id).with_context(lang=order.partner_invoice_id.lang)
 
             invoice_vals = order._prepare_invoice()
             invoiceable_lines = order._get_invoiceable_lines(final)