"ISBN number" meant "international standard book number number" :-D
'booksources-isbn' => 'ISBN:', # only translate this message to other languages if you have to change it
'booksources-go' => 'Go',
'booksources-text' => 'Below is a list of links to other sites that sell new and used books, and may also have further information about books you are looking for:',
-'booksources-invalid-isbn' => 'The given ISBN number does not appear to be valid; check for errors copying from the original source.',
+'booksources-invalid-isbn' => 'The given ISBN does not appear to be valid; check for errors copying from the original source.',
# Magic words
'rfcurl' => 'http://tools.ietf.org/html/rfc$1', # do not translate or duplicate this message to other languages