[FIX] calendar : Server error when mark a scheduled activity as done

Reproduce :

CRM.
Go to a task and schedule next activity.
Then mark this activity as done.
Write a feedback.
Result :

Server error traceback
Solution :

The written feedback is given as a kwarg to translate.
opw-2641747

closes odoo/odoo#76985

X-original-commit: 222bda82e034869590530fc634428dca596be198
Signed-off-by: Arnaud Joset <arj-odoo@users.noreply.github.com>
Signed-off-by: Audric Onockx <auon-odoo@users.noreply.github.com>

addons/calendar/models/mail_activity.py

@@ -36,7 +36,7 @@ class MailActivity(models.Model):
                 description = event.description
                 description = '%s<br />%s' % (
                     description if not tools.is_html_empty(description) else '',
-                    _('Feedback: %(feedback)s', tools.plaintext2html(feedback)) if feedback else '',
+                    _('Feedback: %(feedback)s', feedback=tools.plaintext2html(feedback)) if feedback else '',
                 )
                 event.write({'description': description})
         return messages, activities