This is a discussion topic for the Ore project, SimpleTablist. View the full project on Ore for downloads and more information.
This very simple plugin allows you to customize the header and footer of your tablist. You can edit the text in the config file. The tablist will be updated after a restart or a plugin reload (/sponge plugins reload simpletablist). You have to rejoin after a reload to see the effect.
Version 1.2.0: PlaceholderAPI is supported but not required.