Update 20.test/a/textbook.en.md, 20.test/a/textbook.es.md, 20.test/a/textbook.fr.md, 20.test/c/textbook.en.md, 20.test/c/textbook.es.md, 20.test/c/textbook.fr.md, 20.test/d/textbook.en.md, 20.test/d/textbook.es.md, 20.test/d/textbook.fr.md, 20.test/partials/textbook.en.md, 20.test/README.md, 20.test/default.es.md files
Deleted test/a/textbook.en.md, test/a/textbook.es.md, test/a/textbook.fr.md, test/c/textbook.en.md, test/c/textbook.es.md, test/c/textbook.fr.md, test/d/textbook.en.md, test/d/textbook.es.md, test/d/textbook.fr.md, test/partials/textbook.en.md, test/README.md, test/default.es.md files