Upgraded React Native version

Updated packages to the newest versions

Improved App stability

Updated app styles

Book scanning options have been removed
Added the ability to download the audio for books and learn offline
Added user learning progress
App style refreshed

- Added support for audio of the Hungarian edition of German-Hungarian

- Added support for Slovak editions
- Minor bug fixes

- Minor Bug Fixes

- Added support to book publications in Latvia, Estonia, Slovakia and Hungary
- Bug fixes

- Improvements to the scanning funcionality
- Minor changes to the user interface
- Minor bug fixes

App now supports the 15 Minute Japanese edition

- Minor text correction

- Audio content for [15 Minute Arabic] has been added