we can learn about user's language code. But it is optional field. I want to know what the best practise of bot localization and what does the presence of the field with the language code depend on?
Client version mostly. It is optional because when the bot API came out it did not exist. Nowadays mostly all clients do send it but it used to be the other way around
Then if I want to localize my bot I need to create mechanism of selecting language by myself?
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