My sources of information (e.g., PDF files) in my chatbot's KB are not in English. The purpose of the chatbot is to assist English-speaking users who need such information that's not available in English. So, apart from the KB, the questions and answers from the chatbot, and the queries from the users are always in English. Using the KB, my chatbot seems to be able to somehow find and use the relevant information to answer the user's questions. Unfortunately, the chatbot shows the answers in the language of the source data (e.g., Japanese). How can I make the chatbot give the answers in English with non-English KB?