Multilingual bots auto-detect and switch language based on user’s utterance. Depending on the language selection configuration, the bot continues to communicate with the user in the same language just for that single session or all the following sessions.
In case a developer wants to test the bot for a different language, it can be done using this cheat command. Note that for a published bot, cheat commands will only work in case of Enterprise bot(Named User).
Please go through the below link for the information