[FIX] l10n_din5008_purchase: Fixed purchase document title.

Description of the issue/feature this PR addresses:

The purchase order document in the German localization
(l10n_din5008_purchase) is titled "Purchase Order" way too early. This can
lead to confusion. In the worst case, the vendor will treat the request
for quotation as purchase order.

Current behavior before PR:

If the document has been sent once and then is sent again (either to the
same recipient, or another), the document is titled "Purchase Order",
which will most definitely be treated as such by the recipient.

Desired behavior after PR is merged:

As long as the document is not confirmed (states "draft", "sent", "to
approve"), the title has to be "Request for Quotation". After that
(states "purchase", "done"), the title has to be "Purchase Order".

closes odoo/odoo#87276

X-original-commit: 1238b3f7441f89d959638b9b4520ebfa19430dc5
Signed-off-by: William André (wan) <wan@odoo.com>

addons/l10n_din5008_purchase/models/purchase.py

@@ -32,9 +32,9 @@ class PurchaseOrder(models.Model):
 
     def _compute_l10n_din5008_document_title(self):
         for record in self:
-            if record.state == 'draft':
+            if record.state in ['draft', 'sent', 'to approve']:
                 record.l10n_din5008_document_title = _("Request for Quotation")
-            elif record.state in ['sent', 'to approve', 'purchase', 'done']:
+            elif record.state in ['purchase', 'done']:
                 record.l10n_din5008_document_title = _("Purchase Order")
             elif record.state == 'cancel':
                 record.l10n_din5008_document_title = _("Cancelled Purchase Order")