LPS-35679 Apply the same pattern to Message Boards and Wiki
LPS-35679 Improving consistency in MB & WIKI Subscriptions--> It has no sense to change the admin's configured subject in the backend
LPS-35679 Remove Language Key that it's no longer used
LPS-35679 Add missing PropsValues to make it fully consistent. We already had some PropsValues but not all of them.
LPS-35679 Upgrade process for MB & WIKI email message subject
LPS-35679 Format source