@sam Thanks for the question. Can you please add more details about the use case. You can use Multilanguage chat application with separate LUIS apps for each culture. In order to have single LUIS application, you could use the Translator Text API to translate all incoming messages before they're sent to LUIS. In this case you'll want to use middleware to handle the translation before your LUIS Recognizer is called. You can also use middleware to translate your bot's response so you don't have to use additional localization inside of your bot
Tokenizing in LUIS is different for each language in LUIS.
Here is one more sample where you can select a language from the bot and continue the consversation as required.