How to remove or rename "Monthly Archives" text from post pages

Please tell me how to delete or rename to my local language “Monthly Archives: april 2012” text above my posts. This text is there only when I open post via Archive sidebar.

I am using Twenty eleven child theme,

Link to web page: http://gokul-slovenija.site40.net/2012/04/

thank you,

[No bumping, thank you.]