Thanks to @korinocho for partially suggesting this feature!

With this update, I have added additional customization options for messaging elements of the TokensPlus plugin. See the updated messages.yml for more information. Furthermore, I added messages to be sent to the command sender for the /token add , /token remove and /token set commands.

Additionally, I discovered I had improper permission checks for the /token addall and /token reload commands. These should be correct now.