mapping ISBN group prefixes with ISO 639-1 language codes (2 letters code), when that's possible, that is a strong assumption that a book published in that country would be in that language

$ npm install isbn-groups

Example using isbn-groups and isbn3 for ISBN parsing

const { parse } = require('isbn3')
const isbnGroups = require('isbn-groups')

• example 1

const isbn = '9782707301529'
const { prefix, group } = parse(isbn)
// prefix: '978'
// group: '2'

isbnGroups[prefix][group]
// => 'fr'

• example 2

const isbn = '9789953211206'
const { prefix, group } = parse(isbn)
// prefix: '978'
// group: '9953'

isbnGroups[prefix][group]
// => 'ar'

• isbn3: ISBN parsing, validation, and formatting utilities
• wikidata-lang: mappings between 2-letters language codes (ISO 639-1) and Wikidata ids