The report name is correct in the submenu, but double encoded in the report itself.
Reported in http://forum.piwik.org/read.php?2,78272
PAtch proposed: http://forum.piwik.org/read.php?2,78272,page=1#msg-80178
Modify /plugins/CoreHome/templates/single_report.tpl replacing :
<h2>{$title|htmlentities}</h2>
by
<h2>{$title|escape:'html'}</h2>
(In [5243]) Fixes #2519