Improve mention notification message

Is it possible to change this message:

https://gitlab.syncad.com/hive/hivemind/-/blob/develop/hive/server/hive_api/notify.py#L29

In something like: <src> mentioned you and 212 others ? Would be useful for users to understand in which context they have been mentioned.

Not sure if this is already the case, but would be nice to reduce the notification score if the post contains a lot of mentions.