code: function removeSurveyLanguages (defOptions, credentials, token, requestParams, callback) {
      
    var promise = normalizeRequestParameters(defaults, 'RemoveSurveyLanguages', requestParams).then(function (params) {
      
      var options = {
        method : 'DELETE',
        uri : `v1/Surveys/${params.SurveyId}/Languages/${params.LanguageId}`,
      };
      
      return options;
    
    }).then(options => requestWithTokenCheck(defOptions, credentials, token, options)).nodeify(callback);
    
    return promise;
  }
docs: Remove existing language
  
  {@link https://api.nfieldmr.com/help/api/delete-v1-surveys-surveyid-languages-languageid}