Ultimate Member - Real-time Notifications 2.3.6

* Added: `comment_excerpt` for comment's reply
* Added: the filter hook in `ajax_check_update()` callback
* Tweak: WordPress 5.7 compatibility

* Fixed: Notifications count with `+` symbol
* Fixed: Bad getaway for not logged in users
* Fixed: No new notifications JS

* Added: WPML support for the notifications
* Added: An integration with UM:JobBoardWP extension
* Fixed: Notification sound script
* Tweak: apply_shortcodes() function support