fixes #7403: Missing ISBN numbers (e-book/book) in the preview
fixes #7403: isbns.book -> isbns.pod
fixes #7403: isbns.book -> isbns.pod
#8429 insert class for images
Merge branch 'version-4.5' into version-4.6

Conflicts:
	css/diplomica.css
	templates/GrinDocument.gtpl