[FIX] mail: sudo on user name

Suppose user A creates a sale order S in company X. He then changes to company Y
Sales manager B, in company X, creates the invoice for sale order S.
Bug: the compilation of the report fails because of the user.name in the
template. Then the tracking update fails, making it impossible to validate the
invoice.

opw 1884915

addons/mail/models/mail_tracking_value.py

@@ -60,8 +60,8 @@ class MailTracking(models.Model):
             values.update({
                 'old_value_integer': initial_value and initial_value.id or 0,
                 'new_value_integer': new_value and new_value.id or 0,
-                'old_value_char': initial_value and initial_value.name_get()[0][1] or '',
-                'new_value_char': new_value and new_value.name_get()[0][1] or ''
+                'old_value_char': initial_value and initial_value.sudo().name_get()[0][1] or '',
+                'new_value_char': new_value and new_value.sudo().name_get()[0][1] or ''
             })
         else:
             tracked = False

addons/mail/views/mail_templates.xml

@@ -39,7 +39,7 @@
         </template>
 
         <template id="message_user_assigned">
-            <p>Dear <t t-esc="object.user_id.name"/>,</p>
+            <p>Dear <t t-esc="object.user_id.sudo().name"/>,</p>
             <p>You have been assigned to the <t t-esc="object._description.lower()"/> <t t-esc="object.name_get()[0][1]"/>.</p>
             <p>
                 <a t-att-href="'/mail/view?model=%s&amp;res_id=%s' % (object._name, object.id)"