There is nothing language specific in the knowledge base. Some of the bootstrap scripts are English specific, but the knowledge is language independent.
The bot's knowledge generally separates the words from their meanings. So you could give the same meaning multiple different words in different languages.
If you are just training your bot using questions and responses, then your questions and answer can be in any language.
For the bootstrap scripts, you could try to rewrite these for other languages. For the most part it would just involve changing the "pattern" and "template" text from English to the other language.
Is there a specific script that you are interested in?