When you open the 'Book and Quill' interface, it write "format error" in the book. It also write in the Edited Books.
The format string is as of 13w42b Page %1$s of %2$s
Linked issues
is duplicated by 2
testing discovered 1
Attachments
Comments 6
@irunor
Also appears in the language selection menu when selecting US English.
Where ? Screenshot please.
Created MC-36141
Confirmed