Source code: Survey setup

//Create your translation
var deutschStrings = {
    p: {
        isRequired : "Wird benötigt"
    }
};

//Set the your translation to the locale
SurveyEditor.editorLocalization.locales["de"] = deutschStrings;
//Make this locale the current
//SurveyEditor.editorLocalization.currentLocale = "de";
//Make french locale active
SurveyEditor.editorLocalization.currentLocale = "fr";

var editor = new SurveyEditor.SurveyEditor("editorElement");

Localication

Please make a pull request of your localization toEditor Localization Files.

You have to localize the defaultStrings variable located ineditorLocalization.ts

The example of localization survey js strings arehere.