title: Graphene errors messages
body: <p>I wonder if it is possible to translate the validation error messages that graphene provides? For example: "Authentication credentials were not provided" as shown in the code example below.</p>
  
  <pre><code>{
    "errors": [
      {
        "message": "Authentication credentials were not provided",
        "locations": [
          {
            "line": 2,
            "column": 3
          }
        ]
      }
    ],
    "data": {
      "viewer": null
    }
  }
  </code></pre>