Create a survey with multi languages support

Source code: Survey setup
Survey.defaultBootstrapCss.navigationButton = "btn btn-primary";
Survey.Survey.cssType = "bootstrap";
var survey = new Survey.Model({
 locale: "de",
 pages: [ { name: "page1", elements: [
    {
     type: "matrixdropdown",
     choices: [
      {
       value: 5,
       text: {
        default: "5 (the best)",
        de: "5 (Das beste)"
       }
      }, 4,  3, 2,
      {
       value: 1,
       text: {
        default: "1 (the worst)",
        de: "1 (Das Schlechteste)"
       }
      }
     ],
     columns: [
      {
       name: "rate",
       title: {
        default: "Rating",
        de: "Bewertung"
       }
      }
     ],
     name: "favoriteMovie",
     rows: [ {value: "moonlight", text: "Moonlight" },
      {
       value: "zootopia",
       text: {
        default: "Zootopia",
        de: "Zoomania"
       }
      },
      { value: "water", text: "Hell or High Water" },
      { value: "manchester", text: "Manchester by the Sea" }, {value: "lalaland", text: "La La Land" }
     ],
     title: {
      default: "Please rate these movies",
      de: "Bitte bewerten Sie diese Filme"
     }
    }
   ]
  }
 ]
});


ReactDOM.render(<Survey.Survey model={survey} />, document.getElementById("surveyElement"));


As you see all string properties can be represented as a json object, where key is a locale. If there is no translation for the selected locale then the 'default' value is used, or the first one, if default doesn't exist as well.

Locale: (default is )

survey.locale = yourvalue;
survey.render();