@aki yes, those strings are missing everywhere. They're not localized (which means, they can't be translated). My guess is that as it is an admin page, the devs decided it wasn't necessary. If you think it is (and you get Nic's or Juan's approval) I'd be happy to localize them (so that you can translate them in traducir)
We should add someway to add a method to test for admin things when you are not an admin! I will make a ticket about it when I have some kind of solution...