Nice one... I was digging in there but could not find the Alexander book so thought I was barking up the wrong tree.
SO if anyone needs to know... how its done.
1: Translated String Editor.
2: Create "New Translated String Key"
3: Add your "Translated String".
Key = MYBook
Content = Blah blah blah ... demons dragons etc..
4: Save
5: Drop a Generic Book on your level
6: Edit the Use Actions in the sidebar.
7: In the actions menu, clear any actions and add a BOOK action with the "BOOD ID" of your translated string. in this case "MYBook" .
Save reload etc....
Grab the book in game, read it...