Multi-Lingual bots

I have a query with multi-lingual

  1. Do we need to configure NLPs for each languages if the default language has already been configured?
  2. https://developer.kore.ai/docs/bots/advanced-topics/multi-lingual/building-multi-language-bots/#:~:text=Consumers%20are%20more%20likely%20to,to%20rebuild%20the%20bot%20definitions.
    I went through the above document and it has a language detection section which has three points so could you’ll help me on that?

Thanks
Reni