Switch Book bilingual novels funktioniert nicht

SWITCH BOOK is an application for all those who want to improve their foreign language skills (English, Spanish, Deutch, Italian, Portuguese... How ?  You have a wide range of choices: adventure, classics, children tales, literary essays, fantasy, horror, humor, short stories, passion, thriller, science fiction and more!  For example: French + English, French + Spanish, English + Spanish... multiple language combinations are available.  The SWITCH BOOK novels are well-known classics appreciated by millions of readers.  They are professionally-translated English versions that respects the author’s original intent, with all the cultural and linguistic subtleties that that involves!  Text translations are synchronized; you can switch between languages seamlessly with a swipe of your finger.  SWITCH BOOK is a bookstore of bilingual novels.  Switching back to English is as simple as a "back swipe" and you pick up right where you left off.  Each book contains the novel in two languages.  You do not lose the thread of your reading; the pleasure of reading remains intact.  The books are classified by difficulty levels: medium, intermediate or advanced.  Everything is fluid and instantaneous.  Whether you want to augment your professional career, teach yourself a foreign language, take lessons, travel abroad, teach a language to your children or simply indulge in a personal pleasure, you will progress in fun and exciting ways.