В связи с прекращением поддержки протокола Яндекс.Translate 1.0 режим перевода/транслитерации в версиях HostCMS до 6.5.1 прекратил работу.
Для поддержкит протокола Яндекс.Translate 1.5 необходимо:

1. В константу YANDEX_TRANSLATE_KEY внести ключ, получить который можно на странице https://tech.yandex.ru/key/form.xml?service=trnsl
2. Заменить метод core_str::translate
   

   	/**
   	 * Translation from russian to english
   	 * @param string $string source string
   	 * @return string
   	 */
   	static public function translate($string)
   	{
   		if (defined('YANDEX_TRANSLATE_KEY') && strlen(YANDEX_TRANSLATE_KEY))
   		{
   			$url = 'https://translate.yandex.net/api/v1.5/tr.json/translate?' .
   				'key=' . urlencode(YANDEX_TRANSLATE_KEY) .
   				'&text=' . urlencode($string) .
   				'&lang=en&format=plain';
    
   			$Core_Http = Core_Http::instance()
   				->url($url)
   				->timeout(3)
   				->execute();
    
   			$data = trim($Core_Http->getBody());
    
   			if (strlen($data))
   			{
   				$oData = json_decode($data);
    
   				if (is_object($oData) && $oData->code == 200 && isset($oData->text[0]))
   				{
   					return $oData->text[0];
   				}
   			}
   		}
   		/*else
   		{
   			Core_Log::instance()->clear()
   				->status(Core_Log::$MESSAGE)
   				->write('Can not translate. Constant YANDEX_TRANSLATE_KEY is undefined.');
   		}*/
    
   		return NULL;
   	}
    

3. Заменить метод core_http::execute

   /**
   	 * Executes the business logic.
   	 */
   	public function execute()
   	{
   		$aUrl = @parse_url(trim($this->_url));
    
   		$scheme = strtolower(Core_Array::get($aUrl, 'scheme', 'http'));
    
   		// Change https port
   		$scheme == 'https' && $this->_port == 80
   			&& $this->_port = 443;
    
   		$path = isset($aUrl['host']) && isset($aUrl['path'])
   			? $aUrl['path']
   			: '/';
    
   		$host = Core_Array::get($aUrl, 'host', '');
    
   		$query = isset($aUrl['query']) ?
   			'?' . $aUrl['query']
   			: '';
    
   		$this->_referer = is_null($this->_referer)
   			? "{$scheme}://{$host}"
   			: $this->_referer;
    
   		return $this->_execute($host, $path, $query);
   	}

4. Заменить класс (на некоторых версиях не нужно) core_http_socket

   <?php
    
   defined('HOSTCMS') || exit('HostCMS: access denied.');
    
   /**
    * Http socket driver
    *
    * @package HostCMS 6\Core\Http
    * @version 6.x
    * @author Hostmake LLC
    * @copyright © 2005-2015 ООО "Хостмэйк" (Hostmake LLC), http://www.hostcms.ru
    */
   class Core_Http_Socket extends Core_Http
   {
   	/**
   	 * Send request
   	 * @param string $host host
   	 * @param string $path path
   	 * @param string $query query
   	 * @return self
   	 */
   	protected function _execute($host, $path, $query)
   	{
   		// для 443 порта в fsockopen перед хостом нужно добавлять ssl://
   		$socketHost = $this->_port == 443
   			? 'ssl://' . $host
   			: $host;
    
   		if (!function_exists('fsockopen'))
   		{
   			throw new Core_Exception("Fsockopen has been disabled, please contact your system administrator!");
   		}
    
   		$fp = @fsockopen($socketHost, $this->_port, $errno, $errstr, $this->_timeout);
    
   		if (!$fp)
   		{
   			throw new Core_Exception("Fsockopen failed '%errstr' (%errno)",
   				array('%errstr' => $errstr, '%errno' => $errno), $errno
   			);
   		}
    
   		$out = "{$this->_method} {$path}{$query} HTTP/1.0\r\n";
   		$out .= "Content-Type: {$this->_contentType}\r\n";
   		$out .= "Referer: {$this->_referer}\r\n";
   		$out .= "User-Agent: {$this->_userAgent}\r\n";
    
   		// Additional headers
   		foreach ($this->_additionalHeaders as $name => $value)
   		{
   			$out .= "{$name}: {$value}\r\n";
   		}
    
   		$out .= "Host: {$host}\r\n";
    
   		$bIsPost = $this->_method != 'GET' && ($this->_rawData || count($this->_data) > 0);
    
   		if ($bIsPost)
   		{
   			if ($this->_rawData)
   			{
   				$sPost = $this->_rawData;
   			}
   			else
   			{
   				$aData = array();
   				foreach ($this->_data as $key => $value)
   				{
   					$aData[] = urlencode($key) . '=' . urlencode($value);
   				}
    
   				$sPost = implode('&', $aData);
   			}
    
   			$out .= "Content-length: " . strlen($sPost) . "\r\n";
   		}
    
   		$out .= "Connection: Close\r\n\r\n";
    
   		if ($bIsPost)
   		{
   			$out .= $sPost . "\r\n\r\n";
   		}
    
   		fwrite($fp, $out);
    
   		if (function_exists('stream_set_timeout'))
   		{
   			stream_set_timeout($fp, $this->_timeout);
   		}
    
   		$datastr = '';
    
   		while (!feof($fp))
   		{
   			$datastr .= fgets($fp, 65536);
   		}
    
   		fclose($fp);
    
   		$aTmp = explode("\r\n\r\n", $datastr, 2);
   		unset ($datastr);
    
   		$this->_headers = Core_Array::get($aTmp, 0);
   		$this->_body = Core_Array::get($aTmp, 1);
    
   		return $this;
   	}
   }