Today we have released version 2.5.3 for Bot Inboxer and version 1.3 for Bot Inboxer Standalone. In these versions, we have given template delete option. Now you can delete any template that is not currently being used. It will also give you a list of bots where this template has been used.
We have also given an option that displays the label name of the subscribers but for this, you'll need messenger broadcaster add-on.