Google Cloud Translation API

For Google Cloud Translate (More advanced translation than free Google previously), you need to set the following environment variables

GOOGLE_TRANSLATE_TYPE=service_account
GOOGLE_TRANSLATE_PROJECT_ID=your_project_id
GOOGLE_TRANSLATE_PRIVATE_KEY=your_private_key
GOOGLE_TRANSLATE_CLIENT_EMAIL=your_client_email
GOOGLE_TRANSLATE_CLIENT_CERT_URL=your_client_cert_url

See more here: Google Translate Setup