config.json

{
  "langs": [
    "en-US",
    "es-ES",
    "zh-CN"
  ],
  "elements": {
    "corespring-choice": "^2.1.0"
  },
  "models": [
    {
      "id": "1",
      "element": "corespring-choice",
      "defaultLang": "en-US",
      "langs": [
        "en-US",
        "es-ES",
        "zh-CN"
      ],
      "prompt": [
        {
          "lang": "en-US",
          "value": "Which of these northern European countries are EU members?"
        },
        {
          "lang": "es-ES",
          "value": "¿Cuál de estos países del norte de Europa son miembros de la UE?"
        },
        {
          "lang": "zh-CN",
          "value": "这些北欧国家中哪个是欧盟成员？"
        }
      ],
      "choiceMode": "checkbox",
      "keyMode": "numbers",
      "choices": [
        {
          "correct": true,
          "value": "sweden",
          "label": [
            {
              "lang": "en-US",
              "value": "Sweden"
            },
            {
              "lang": "es-ES",
              "value": "Suecia"
            },
            {
              "lang": "zh-CN",
              "value": "瑞典"
            }
          ],
          "feedback": {
            "type": "custom",
            "custom": [
              {
                "lang": "en-US",
                "value": "Sweden joined in 1995"
              },
              {
                "lang": "es-ES",
                "value": "Suecia se unió a la UE en 1995"
              },
              {
                "lang": "zh-CN",
                "value": "瑞典于1995年加入欧盟"
              }
            ]
          }
        },
        {
          "value": "iceland",
          "label": [
            {
              "lang": "en-US",
              "value": "Iceland"
            },
            {
              "lang": "es-ES",
              "value": "Islandia"
            },
            {
              "lang": "zh-CN",
              "value": "冰岛"
            }
          ],
          "feedback": {
            "type": "custom",
            "custom": [
              {
                "lang": "en-US",
                "value": "Iceland is not an EU member state"
              },
              {
                "lang": "es-ES",
                "value": "Islandia no es un estado miembro de la UE"
              },
              {
                "lang": "zh-CN",
                "value": "冰岛不是欧盟成员国"
              }
            ]
          }
        },
        {
          "value": "norway",
          "label": [
            {
              "lang": "en-US",
              "value": "Norway"
            },
            {
              "lang": "es-ES",
              "value": "Noruega"
            },
            {
              "lang": "zh-CN",
              "value": "挪威"
            }
          ],
          "feedback": {
            "type": "custom",
            "custom": [
              {
                "lang": "en-US",
                "value": "Norway is not an EU member, but they are a member for the Single Market"
              },
              {
                "lang": "es-ES",
                "value": "Noruega no es miembro de la UE, sino que son un miembro de Mercado Único"
              },
              {
                "lang": "zh-CN",
                "value": "挪威不是欧盟成员国，但他们是单一市场的成员"
              }
            ]
          }
        },
        {
          "correct": true,
          "value": "finland",
          "label": [
            {
              "lang": "en-US",
              "value": "Finland"
            },
            {
              "lang": "es-ES",
              "value": "Finlandia"
            },
            {
              "lang": "zh-CN",
              "value": "芬兰"
            }
          ],
          "feedback": {
            "type": "custom",
            "custom": [
              {
                "lang": "en-US",
                "value": "Finland joined the EU in 1995"
              },
              {
                "lang": "es-ES",
                "value": "Finlandia se unió a la UE en 1995"
              },
              {
                "lang": "zh-CN",
                "value": "芬兰于1995年加入欧盟"
              }
            ]
          }
        }
      ]
    }
  ]
}