This week's book giveaway is in the Reactive Progamming forum. We're giving away four copies of Reactive Streams in Java: Concurrency with RxJava, Reactor, and Akka Streams and have Adam Davis on-line! See this thread for details.
JForum supports internationalization. There is a file en_US.css in which you can override styles for English/US. I imagine there is a standard internationalization code for Cherokee. Similarly, there is en_US.properties for the actual text. That works if you are using the user selections.
If you want to always display Cherokee preferences, I'm thinking the easiest thing to do is change the default files themselves.