diff --git a/lib/documentmanagement/documentutil.inc.php b/lib/documentmanagement/documentutil.inc.php
index ac6479d..fe855f5 100644
--- a/lib/documentmanagement/documentutil.inc.php
+++ b/lib/documentmanagement/documentutil.inc.php
@@ -143,7 +143,7 @@ class KTDocumentUtil {
 
     function checkout($oDocument, $sCheckoutComment, $oUser) {
         if ($oDocument->getIsCheckedOut()) {
-            return PEAR::raiseError('Already checked out.');
+            return PEAR::raiseError(_kt('Already checked out.'));
         }
         
         // FIXME at the moment errors this _does not_ rollback.