diff -r 7f71e366cb5e -r bd4addfb6fd5 web/views/navigation.py
--- a/web/views/navigation.py	Tue Jul 31 10:12:06 2012 +0200
+++ b/web/views/navigation.py	Tue Jul 31 11:19:11 2012 +0200
@@ -364,11 +364,13 @@
 
     @property
     def prev_icon(self):
-        return '<img src="%s"/>' % xml_escape(self._cw.data_url('go_prev.png'))
+        return '<img src="%s" alt="%s" />' % (
+            xml_escape(self._cw.data_url('go_prev.png')), self._cw._('previous page'))
 
     @property
     def next_icon(self):
-        return '<img src="%s"/>' % xml_escape(self._cw.data_url('go_next.png'))
+        return '<img src="%s" alt="%s" />' % (
+            xml_escape(self._cw.data_url('go_next.png')), self._cw._('next page'))
 
     def init_rendering(self):
         adapter = self.entity.cw_adapt_to('IPrevNext')