Added hidden link to leave the reader view.
Remove DOMAIN from translations.
Merge pull request #55 from 4teamwork/jin-close-reader-link

Added hidden link to leave the reader view.
Merge branch 'master' into v3.x

Conflicts:
	docs/HISTORY.txt
	ftw/book/locales/de/LC_MESSAGES/ftw.book.po
	ftw/book/locales/fr/LC_MESSAGES/ftw.book.po
	ftw/book/locales/ftw.book.pot