message: fix: pybabel extract fails
diff: @@ -76,7 +76,9 @@ class EmailNotification(BaseNotification): # pylint: disable=too-few-public-met
  """,
  description=self._content.description or "",
  url=self._content.url,
  - img_tag=f'<img src="cid:{msgid}">' if self._content.screenshot else "",
  + img_tag='<img src="cid:{}">'.format(msgid)
  + if self._content.screenshot
  + else "",
  )
  if self._content.screenshot:
  image = {msgid: self._content.screenshot}
  