CPageTemplate::IncludeLangFile

static function IncludeLangFile($filepath)
{
	$file = basename($filepath);
	$dir = dirname($filepath);

	$langSubst = LangSubst(LANGUAGE_ID);
	$fname = $dir."/lang/".$langSubst."/".$file;
	$fname = BitrixMainLocalizationTranslation::convertLangPath($fname, $langSubst);
	if(LANGUAGE_ID <> "en" && LANGUAGE_ID <> "ru")
	{
		if(file_exists($fname))
		{
			__IncludeLang($fname, false, true);
		}
	}

	$fname = $dir."/lang/".LANGUAGE_ID."/".$file;
	$fname = BitrixMainLocalizationTranslation::convertLangPath($fname, LANGUAGE_ID);
	if(file_exists($fname))
	{
		__IncludeLang($fname, false, true);
	}
}