curl "https://api.phrase.com/v2/projects/:project_id/blacklisted_keys/:id" \
  -u USERNAME_OR_ACCESS_TOKEN \
  -X DELETE

{
  "message": "Validation Failed",
  "errors": [
    {
      "resource": "Resource",
      "field": "name",
      "message": "can't be blank"
    }
  ]
}