Index: /trunk/admin/include/configuration_watermark_process.inc.php
===================================================================
--- /trunk/admin/include/configuration_watermark_process.inc.php	(revision 14546)
+++ /trunk/admin/include/configuration_watermark_process.inc.php	(revision 14549)
@@ -36,5 +36,8 @@
   if (IMAGETYPE_PNG != $type)
   {
-    $errors['watermarkImage'] = 'PNG';
+    $errors['watermarkImage'] = sprintf(
+      l10n('Allowed file types: %s.'),
+      'PNG'
+      );
   }
   else
@@ -188,4 +191,9 @@
     clear_derivative_cache($changed_types);
   }
+
+  array_push(
+    $page['infos'],
+    l10n('Your configuration settings are saved')
+    );
 }
 else