"Filter not found" alert Email alert does not format according to the notification
**Describe the bug**
The alert received via email remains unformatted, see example:

```
Your configured CSS/xPath filters of '.jobs-list__list' for {watch_url} did not appear on the page after 6 attempts, did the page change layout?
 
 Link: {base_url}/edit/{watch_uuid}
 
 Thanks - Your omniscient changedetection.io installation :)
```

**Version**
*Exact version* in the top right area: v0.40.0.2

**To Reproduce**

Steps to reproduce the behavior:
1. Nothing needed just set a wrong CSS selector

**Expected behavior**
The alert should respect the variables in curled brackets, e.g. {watch_url}, and ideally should follow a similar pattern of notification (email subject) as set in the notification settings

**Desktop (please complete the following information):**
 - OS: Windows
 - Browser: Edge
 - Version: 108.0.1462.54


diff --git a/changedetectionio/tests/test_filter_failure_notification.py b/changedetectionio/tests/test_filter_failure_notification.py
index dd12d79..1e89fc8 100644
--- a/changedetectionio/tests/test_filter_failure_notification.py
+++ b/changedetectionio/tests/test_filter_failure_notification.py
@@ -1,8 +1,7 @@
 import os
 import time
-import re
 from flask import url_for
-from .util import set_original_response, live_server_setup
+from .util import set_original_response, live_server_setup, extract_UUID_from_client
 from changedetectionio.model import App
 
 
@@ -121,6 +120,10 @@ def run_filter_test(client, content_filter):
         notification = f.read()
     assert not 'CSS/xPath filter was not present in the page' in notification
 
+    # Re #1247 - All tokens got replaced
+    uuid = extract_UUID_from_client(client)
+    assert uuid in notification
+
     # cleanup for the next
     client.get(
         url_for("form_delete", uuid="all"),
diff --git a/changedetectionio/update_worker.py b/changedetectionio/update_worker.py
index 0e902a8..0159828 100644
--- a/changedetectionio/update_worker.py
+++ b/changedetectionio/update_worker.py
@@ -93,7 +93,7 @@ class update_worker(threading.Thread):
             return
 
         n_object = {'notification_title': 'Changedetection.io - Alert - CSS/xPath filter was not present in the page',
-                    'notification_body': "Your configured CSS/xPath filters of '{}' for {{watch_url}} did not appear on the page after {} attempts, did the page change layout?\\n\\nLink: {{base_url}}/edit/{{watch_uuid}}\\n\\nThanks - Your omniscient changedetection.io installation :)\\n".format(
+                    'notification_body': "Your configured CSS/xPath filters of '{}' for {{{{watch_url}}}} did not appear on the page after {} attempts, did the page change layout?\\n\\nLink: {{{{base_url}}}}/edit/{{{{watch_uuid}}}}\\n\\nThanks - Your omniscient changedetection.io installation :)\\n".format(
                         ", ".join(watch['include_filters']),
                         threshold),
                     'notification_format': 'text'}
['changedetectionio/tests/test_filter_failure_notification.py', 'changedetectionio/update_worker.py']