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TMDB tries to be localized wherever possible. While most of our metadata endpoints support translated data, there are still a few gaps that do not. The two main areas that are not are person names and characters. We’re working to support this.

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ISO 639-1

The language code system we use is ISO 639-1. Unfortunately, there are a number of languages that don’t have a ISO-639-1 representation. We may decide to upgrade to ISO-639-3 in the future but do not have any immediate plans to do so.

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ISO 3166-1

You’ll usually find our language codes mated to a country code in the format of en-US. The country codes in use here are ISO 3166-1.
Images do not yet support the language-COUNTRY notation. This will be improved in the future. Take a read through the image language documentation to learn how to partly get around this limitation.
Now that you know how languages work, let’s look at some example requests. 
curl --request GET \
     --url 'https://api.themoviedb.org/3/tv/1399?language=en-US' \
     --header 'Authorization: Bearer {ACCESS_TOKEN}' \
     --header 'accept: application/json'