The book is written means that someone was writting a book and has now finished it, thus should be translated to Το βιβλίο γράφηκε.
Το βιβλίο γράφεται translates to The book is been written.
The book is being written.
I just reported a number of these sentences.
Thank you Apostolos and D_.. we do appreciate input to help us clean up these errors. Keep your input coming it is much appreciated.