What are language shelves?

The language shelves show all the books in the different languages ​​available in Polylino, e.g. all books available in Albanian are shown in the language shelf "Albanian". When you open a book from a language shelf, the audio is set to the language of the book shelf, not English. If you open the book in child mode, the default settings is that only the selected language and English appear in the book, so that the child has fewer languages ​​to choose from. This can be set so that more than these two languages ​​are displayed.