[FIX] purchase: View RFQ button

- Create a RFQ
- Send it to the customer

The email sent contains a 'View Purchase Order' button instead of 'View
Request for Quotation'.

We make use of the previous commit to correct the issue.

opw-1915230

addons/purchase/i18n/purchase.pot

@@ -1483,8 +1483,10 @@ msgid "Reporting"
 msgstr ""
 
 #. module: purchase
+#: code:addons/purchase/models/purchase.py:276
 #: model:ir.actions.report,name:purchase.report_purchase_quotation
 #: model_terms:ir.ui.view,arch_db:purchase.report_purchasequotation_document
+#, python-format
 msgid "Request for Quotation"
 msgstr ""
 

addons/purchase/models/purchase.py

@@ -264,6 +264,22 @@ class PurchaseOrder(models.Model):
             'force_email': True,
             'mark_rfq_as_sent': True,
         })
+
+        # In the case of a RFQ or a PO, we want the "View..." button in line with the state of the
+        # object. Therefore, we pass the model description in the context, in the language in which
+        # the template is rendered.
+        lang = self.env.context.get('lang')
+        if {'default_template_id', 'default_model', 'default_res_id'} <= ctx.keys():
+            template = self.env['mail.template'].browse(ctx['default_template_id'])
+            if template and template.lang:
+                lang = template._render_template(template.lang, ctx['default_model'], ctx['default_res_id'])
+
+        self = self.with_context(lang=lang)
+        if self.state in ['draft', 'sent']:
+            ctx['model_description'] = _('Request for Quotation')
+        else:
+            ctx['model_description'] = _('Purchase Order')
+
         return {
             'name': _('Compose Email'),
             'type': 'ir.actions.act_window',