Formio.createForm(document.getElementById('formio'), {
  components: [
    {
      type: 'textfield',
      key: 'firstName',
      label: 'First Name',
      placeholder: 'Enter your first name',
      input: true
    },
    {
      type: 'textfield',
      key: 'lastName',
      label: 'Last Name',
      placeholder: 'Enter your last name',
      input: true
    },
    {
      type: 'survey',
      key: 'questions',
      label: 'Survey',
      values: [
        {
          label: 'Great',
          value: 'great'
        },
        {
          label: 'Good',
          value: 'good'
        },
        {
          label: 'Poor',
          value: 'poor'
        }
      ],
      questions: [
        {
          label: 'How would you rate the Form.io platform?',
          value: 'howWouldYouRateTheFormIoPlatform'
        },
        {
          label: 'How was Customer Support?',
          value: 'howWasCustomerSupport'
        },
        {
          label: 'Overall Experience?',
          value: 'overallExperience'
        }
      ]
    },
    {
      type: 'button',
      action: 'submit',
      label: 'Submit',
      theme: 'primary'
    }
  ]
}, {
  language: 'sp',
  i18n: {
    sp: {
      'First Name': 'Nombre de pila',
      'Last Name': 'Apellido',
      'Enter your first name': 'Ponga su primer nombre',
      'Enter your last name': 'Introduce tu apellido',
      'How would you rate the Form.io platform?': '¿Cómo calificaría la plataforma Form.io?',
      'How was Customer Support?': '¿Cómo fue el servicio de atención al cliente?',
      'Overall Experience?': '¿Experiencia general?',
      Survey: 'Encuesta',
      Excellent: 'Excelente',
      Great: 'Estupendo',
      Good: 'Bueno',
      Average: 'Promedio',
      Poor: 'Pobre',
      'Submit': 'Enviar',
      complete: 'Presentación Completa',
    },
    ch: {
      'First Name': '名字',
      'Last Name': '姓',
      'Enter your first name': '输入你的名字',
      'Enter your last name': '输入你的姓氏',
      'How would you rate the Form.io platform?': '你如何评价Form.io平台？',
      'How was Customer Support?': '客户支持如何？',
      'Overall Experience?': '总体体验？',
       Survey: '调查',
      Excellent: '优秀',
      Great: '大',
      Good: '好',
      Average: '平均',
      Poor: '错',
      'Submit': '提交',
      complete: '提交完成',
    }
  }
}).then(function(form) {
  window.setLanguage = function(lang) {
    form.language = lang;
  };
});

Result