How can i make my web app multilingual

How can i make my web app multilingual

  

Hello, I have a question about adding languages to my web app, I can't find a helpful guide on this. I want to add more than one language to my web app, how can i do that? I did use the Locals on the service studio but I don't know what to do next, how to add a link in the header to change the language? Thank you in advance :)

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