How to hide the "save and add another" button in admin page?

I have been trying all day. What I am doing is trying to have a model for an "about" page, which I want to limit to 1 item. It doesn't really make sense to have multiple "abouts". I've done everything described here

http://stackoverflow.com/questions/13101281/in-django-admin-how-can-i-hide-save-and-continue-and-save-and-add-another-butto

but can't get it to work, it works if in the ctx update I set show_save_and_add_another to false, but then the "save and add another" button doesn't show up for any model.

Please help.

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