[RFC] don't delete texts when deleting a page

Many objects like pages and texts are not actually deleted but only marked as such. Currently when marking a page as deleted all of its text are marked as deleted as well. That way the page title (and probably other things) are not available anymore which looks strange in event messages.

> Daniel deleted (Unknown)

I am not sure if simply not deleting the texts is the right way to do it so I am open for feedback.