Change angle path without reloading views or controller

I am creating a web platform with angularjs and nodejs, I have a problem with the function of changing the language.

Routing:

$routeProvider
  .when('/:lang?/index', {
    templateUrl: 'modules/Home/HomeView.html',
    controller: 'HomeCtrl'
  });

Example url: link

View part of language change:

<ng-repeat ng-repeat="lang in availableLangs track by $index">
      <li><a href="" ng-class="{'active': lang === currentLanguage}" ng-click="translate(lang)"> {{lang}}</a></li>
      <li ng-if=" $index < availableLangs.length - 1">|</li>
    </ng-repeat>

Controller, translate function

$scope.translate = function (langKey) {
      if ($routeParams.lang) {
        $route.updateParams({ lang: langKey });
      }
      $translate.use(langKey);
      $scope.showLangSelector = false;
    };

This is working for me, but I reload again the controller and the view, I want to know if there is an option to just change the url in the parameter: lang but without having to reload.

Thanks