notifications: Shorten string for redacted content.

Replace the long string for organisations that have notification
body/content disabled (settings.PUSH_NOTIFICATION_REDACT_CONTENT
set to true) with "New message".

Fixes #29152

zerver/lib/push_notifications.py

@@ -922,13 +922,7 @@ def get_mobile_push_content(rendered_content: str) -> str:
         return plain_text
 
     if settings.PUSH_NOTIFICATION_REDACT_CONTENT:
-        return (
-            "*"
-            + _(
-                "This organization has disabled including message content in mobile push notifications"
-            )
-            + "*"
-        )
+        return _("New message")
 
     elem = lxml.html.fragment_fromstring(rendered_content, create_parent=True)
     change_katex_to_raw_latex(elem)

zerver/tests/test_push_notifications.py

@@ -4109,7 +4109,7 @@ class TestGetAPNsPayload(PushNotificationTest):
             "alert": {
                 "title": "Cordelia, Lear's daughter, King Hamlet, Othello, the Moor of Venice",
                 "subtitle": "King Hamlet:",
-                "body": "*This organization has disabled including message content in mobile push notifications*",
+                "body": "New message",
             },
             "sound": "default",
             "badge": 0,
@@ -4305,7 +4305,7 @@ class TestGetGCMPayload(PushNotificationTest):
                 "event": "message",
                 "zulip_message_id": message.id,
                 "time": datetime_to_timestamp(message.date_sent),
-                "content": "*This organization has disabled including message content in mobile push notifications*",
+                "content": "New message",
                 "content_truncated": False,
                 "server": settings.EXTERNAL_HOST,
                 "realm_id": hamlet.realm.id,