Remove the theme author from the admin

Hi everyone,

I would like to remove the author of a theme from my admin area (wp-admin). So I’m not talking about the footer of the website but about the administration area.

In the section called Appearence > Themes there are the installed themes listed, each one with the author underneath. For instance, below the Twenty Eleven theme there is the text “By the WordPress team”

How do I remove that or replace it with something else? In what php or css do I have to make the modification?

Thanks,
Larry