In Moodle 2.5.1, although event descriptions appear to be filtered, event descriptions are not. As I am working on a multilingual site which leverages multilang without it my content from every language is included.
The solution is to change line 127 of /calendar/view.php, replacing:
echo $renderer->show_day($calendar);
...with...
echo format_text($renderer->show_day($calendar),array('trusted' => true,'noclean' => true, 'para' => false));
What do I need to do to get this change integrated into the core Moodle code?
Best regards,
Michael