Filenames with & in it do not display

See https://commons.wikimedia.org/wiki/File:Stephansdom_&_Haashaus.jpg in http://stats.wikilovesmonuments.cl/?items=60&pais=austria&usuario=Cheeky76&dia=2014-09-06 as an example.

Filenames like File:Stephansdom_&_Haashaus.jpg (using an ampersand) do not display correctly.

Thanks for keeping the tool running and stable.
regards Herzi Pinki