Yes, Kore.ai does support multiple languages for Knowledge Collection. In Kore.ai, Knowledge Collection will be specific to the bot language and for each and every language, you need to have a separate Knowledge Graph defined. Currently Kore.ai supports 4 different languages.
For more details on enabling additional languages, please refer the following Knowledge Base article.
Once you have enabled the additional Language(s), you can build the Knowledge Graph/Collection in specific to respective language. For more details on building a Knowledge Collection, please refer the below Knowledge Base article.