Index: mod_rewrite_helper.php
===================================================================
--- mod_rewrite_helper.php	(revision 12690)
+++ mod_rewrite_helper.php	(working copy)
@@ -38,6 +38,13 @@
 		var $_modulePrefix = false;
 
 		/**
+		 * Charset, used to parse url, while language is not detected from it
+		 *
+		 * @var string
+		 */
+		var $_charset = 'UTF-8';
+
+		/**
 		 * Constructor of kModRewriteHelper class
 		 *
 		 * @return kModRewriteHelper
@@ -120,7 +127,7 @@
 			}
 
 			$vars = Array ('pass' => Array ('m'));
-			$url_parts = $url ? explode('/', trim(mb_strtolower($url), '/')) : Array ();
+			$url_parts = $url ? explode('/', trim(mb_strtolower($url, $this->_charset), '/')) : Array ();
 
 			if (($this->HTTPQuery->Get('rewrite') == 'on') || !$url_parts) {
 				$this->_setDefaultValues($vars);
@@ -612,7 +619,7 @@
 
 				// 1. Set virtual page as template, this will be replaced to physical template later in kApplication::Run.
 				// 2. Don't set CachedTemplate field as template here, because we will loose original page associated with it's cms blocks!
-				$vars['t'] = strtolower( preg_replace('/^Content\//i', '', $last_category_info['NamedParentPath']) );
+				$vars['t'] = mb_strtolower( preg_replace('/^Content\//i', '', $last_category_info['NamedParentPath']), $this->_charset );
 
 				$vars['m_cat_id'] = $last_category_info['CategoryId'];
 				$vars['is_virtual'] = true; // for template from POST, strange code there!