json_schema: {
      "properties": {
          "language": {
              "$default": {
                  "$source": "argv",
                  "index": 0
              },
              "description": "The language to be added",
              "type": "string"
          },
          "languages": {
              "description": "Languages to be added (comma separated list like 'en,de,fr').",
              "type": "string"
          }
      },
      "title": "addLanguage Schema",
      "type": "object"
  }