Pimcore\Config::getSystemConfig PHP Method

    public static function getSystemConfig($forceReload = false)
    {
        $config = null;
        if (\Zend_Registry::isRegistered("pimcore_config_system") && !$forceReload) {
            $config = \Zend_Registry::get("pimcore_config_system");
        } else {
            try {
                $file = self::locateConfigFile("system.php");
                if (file_exists($file)) {
                    $config = new \Zend_Config(include $file);
                } else {
                    throw new \Exception($file . " doesn't exist");
                }
                self::setSystemConfig($config);
            } catch (\Exception $e) {
                $file = self::locateConfigFile("system.php");
                Logger::emergency("Cannot find system configuration, should be located at: " . $file);
                if (is_file($file)) {
                    $m = "Your system.php located at " . $file . " is invalid, please check and correct it manually!";
                    Tool::exitWithError($m);
                }
            }
        }
        return $config;
    }

 public function addLanguage($languageToAdd)
 {
     // Check if language is not already added
     if (in_array($languageToAdd, Tool::getValidLanguages())) {
         $result = false;
     } else {
         // Read all the documents from the first language
         $availableLanguages = Tool::getValidLanguages();
         $firstLanguageDocument = \Pimcore\Model\Document::getByPath('/' . reset($availableLanguages));
         \Zend_Registry::set('SEI18N_add', 1);
         // Add the language main folder
         $document = Page::create(1, array('key' => $languageToAdd, "userOwner" => 1, "userModification" => 1, "published" => true, "controller" => 'default', "action" => 'go-to-first-child'));
         $document->setProperty('language', 'text', $languageToAdd);
         // Set the language to this folder and let it inherit to the child pages
         $document->setProperty('isLanguageRoot', 'text', 1, false, false);
         // Set as language root document
         $document->save();
         // Add Link to other languages
         $t = new Keys();
         $t->insert(array("document_id" => $document->getId(), "language" => $languageToAdd, "sourcePath" => $firstLanguageDocument->getFullPath()));
         // Lets add all the docs
         $this->addDocuments($firstLanguageDocument->getId(), $languageToAdd);
         \Zend_Registry::set('SEI18N_add', 0);
         $oldConfig = Config::getSystemConfig();
         $settings = $oldConfig->toArray();
         $languages = explode(',', $settings['general']['validLanguages']);
         $languages[] = $languageToAdd;
         $settings['general']['validLanguages'] = implode(',', $languages);
         $config = new \Zend_Config($settings, true);
         $writer = new \Zend_Config_Writer_Xml(array("config" => $config, "filename" => PIMCORE_CONFIGURATION_SYSTEM));
         $writer->write();
         $result = true;
     }
     return $result;
 }