List supported locales

const options = {
  method: 'GET',
  headers: {'x-spree-api-key': '<api-key>', Authorization: 'Bearer <token>'}
};

fetch('http://{defaultHost}/api/v3/admin/locales', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request GET \
  --url http://{defaultHost}/api/v3/admin/locales \
  --header 'Authorization: Bearer <token>' \
  --header 'x-spree-api-key: <api-key>'

{
  "data": [
    {
      "code": "de",
      "name": "de",
      "default": false,
      "rtl": false
    },
    {
      "code": "en",
      "name": "English",
      "default": true,
      "rtl": false
    },
    {
      "code": "fr",
      "name": "fr",
      "default": false,
      "rtl": false
    }
  ]
}