Fix NBU course update (issue #4053)

Fix_NBU_course_update_(issue_#4053).patch

Index: server/lib/course.class.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- server/lib/course.class.php	(date 1397743696000)
+++ server/lib/course.class.php	(revision )
@@ -10,7 +10,7 @@
 {
     public $db;
     public $cache_table;
-    public $content_url = 'http://www.bank.gov.ua/control/uk/curmetal/detail/currency?period=daily';
+    public $content_url = 'http://www.bank.gov.ua/control/en/curmetal/detail/currency?period=daily';
     public $codes = array(840, 978, 643);
     
     public function __construct(){
@@ -26,7 +26,7 @@
         $result = array();
         $content = file_get_contents($this->content_url);
         if ($content){
-            preg_match("/<td class=\"date\">([\d,\.]+)<\/td>/",$content,$arr);
+            preg_match("/([\d]{2}\.[\d]{2}\.[\d]{4})<\/b>/",$content,$arr);
             $result['title'] = _('Exchange rate on').' '.$arr[1];
             $result['on_date'] = $arr[1];
             $result['data'] = array();
\ No newline at end of file