talks_admin members can add unapproved talks to the personal schedule multiple times

[perlpunk]

For figuring out which talks are the most interesting, members of talks_admin can add unapproved talks to their schedule.
Clicking on the star results in the name being added to the list, but after that you can click again, even if you reload the page. Then the name is added multiple times to the list. Also the count increases on the favorite talks page.

And there is no way to remove the talk from your schedule again.