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available_languages list all supported languages of DeepL API Pro.
available_languages
available_languages(auth_key = "your_key")
authentication key.
To get an authentication key, you need to register for a DeepL API Pro account (https://www.deepl.com/pro#developer).
DeepL API documentations
if (FALSE) { available_languages(auth_key = "my_key") }
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