Change filter titles

Hello,
Is there a way to change the filter titles in the filter bar. i.e i’d like the option to change ‘sermon book’ to ‘sermon date’ or ‘sermon month’ to allow a search of sermons by date it was preached?

http://tec-online.com

Many thanks

http://ww.wp.xz.cn/extend/plugins/sermon-manager-for-wordpress/