Installation 

Install the extension using composer:

composer require "dmitryd/dd-deepl"
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If you need to use the console command, require also undkonsorten/extbase-cli-aware-configuration-manager and read the documebtation at https://github.com/undkonsorten/extbase-cli-aware-configuration-manager.

Go to https://www.deepl.com/signup and sign up. Get a free API key.

Configure API key in the TypoScript constants like this:

module.tx_dddeepl.settings.apiKey = <Insert your API key here>
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You can also set DeepL API key via web server environment varable TYPO3_DEEPL_API_KEY.