Method getCurrentLanguage

/**
 * Gets the current language
 *
 * @param   boolean  $detectBrowser  Flag indicating whether to use the browser language as a fallback.
 *
 * @return  string  The language string
 *
 * @since   3.1
 * @note    CmsHelper::getCurrentLanguage is the preferred method
 */
public static function getCurrentLanguage($detectBrowser = true)
{
    $app = Factory::getApplication();
    $langCode = null;
    // Get the languagefilter parameters
    if (Multilanguage::isEnabled()) {
        $plugin = PluginHelper::getPlugin('system', 'languagefilter');
        $pluginParams = new Registry($plugin->params);
        if ((int) $pluginParams->get('lang_cookie', 1) === 1) {
            $langCode = $app->input->cookie->getString(ApplicationHelper::getHash('language'));
        } else {
            $langCode = $app->getSession()->get('plg_system_languagefilter.language');
        }
    }
    // No cookie - let's try to detect browser language or use site default
    if (!$langCode) {
        if ($detectBrowser) {
            $langCode = LanguageHelper::detectLanguage();
        } else {
            $langCode = ComponentHelper::getParams('com_languages')->get('site', 'en-GB');
        }
    }
    return $langCode;
}