Google Cloud Translator offers a free tier of 500k of translated chars each month. More pricing information here.

To be able to translate contents with Google, you need a Google Cloud Platform account with billing enabled and a service account key. You can create an account and a service account key following Google official instruction.

Make sure to download and keep the service account key in a safe place.

Upload your Google Cloud Service account key and click Save.

Once saved, the key will be encrypted and you will no longer be able to see it. Keep a copy of your service account key in a safe place.

Lango will verify your configuration. If everything goes well, the provider will be set as active and default, as in the screen below.