Updated the install config with the latest parts for language.

install/config/config.php

@@ -154,7 +154,61 @@ $config['url_suffix'] = '';
 | than english.
 |
  */
-$config['language']	= 'english';
+$lang = 'english'; // this language will be used per default
+
+if (isset($_COOKIE["language"])) {
+	$tmp_value = $_COOKIE["language"];
+	if (!empty($tmp_value)) { $lang = $tmp_value; }
+}
+switch ($lang) {	// do this for security-reasons! parse only langs, which are known to us
+case 'dutch':
+	$config['language'] = $lang;
+	break;
+case 'chinese_simplified':
+	$config['language'] = $lang;
+	break;
+case 'spanish':
+	$config['language'] = $lang;
+	break;
+case 'czech':
+	$config['language'] = $lang;
+	break;
+case 'bulgarian':
+	$config['language'] = $lang;
+	break;
+case 'turkish':
+	$config['language'] = $lang;
+	break;
+case 'swedish':
+	$config['language'] = $lang;
+	break;
+case 'polish':
+	$config['language'] = $lang;
+	break;
+case 'italian':
+	$config['language'] = $lang;
+	break;
+case 'greek':
+	$config['language'] = $lang;
+	break;
+case 'french':
+	$config['language'] = $lang;
+	break;
+case 'finnish':
+	$config['language'] = $lang;
+	break;
+case 'russian':
+	$config['language'] = $lang;
+	break;
+case 'english':
+	$config['language'] = $lang;
+	break;
+case 'german':
+	$config['language'] = $lang;
+	break;
+}
+
+$config['cl_multilanguage']=true;
 
 /*
 |--------------------------------------------------------------------------