feat: user notification settings for group.leave event

install/data/defaults.json

@@ -89,6 +89,7 @@
     "notificationType_new-chat": "notification",
     "notificationType_new-group-chat": "notification",
     "notificationType_group-invite": "notification",
+    "notificationType_group-leave": "notification",
     "notificationType_group-request-membership": "notification",
     "notificationType_mention": "notification",
     "notificationType_new-register": "notification",

public/language/en-GB/notifications.json

@@ -69,6 +69,7 @@
 	"notificationType_new-chat": "When you receive a chat message",
 	"notificationType_new-group-chat": "When you receive a group chat message",
 	"notificationType_group-invite": "When you receive a group invite",
+	"notificationType_group-leave": "When a user leaves your group",
 	"notificationType_group-request-membership": "When someone requests to join a group you own",
 	"notificationType_new-register": "When someone gets added to registration queue",
 	"notificationType_post-queue": "When a new post is queued",

src/notifications.js

@@ -27,6 +27,7 @@ Notifications.baseTypes = [
 	'notificationType_new-chat',
 	'notificationType_new-group-chat',
 	'notificationType_group-invite',
+	'notificationType_group-leave',
 	'notificationType_group-request-membership',
 ];