What is the Learn Polish Free application, how does it work?

According to the introduction of MetaLanguage, Learn Polish Free is a Education app on the Android platform. There is currently a 6.0 version released on Nov 26, 2018, you can see the details below.

Learn Polish is a simple app for anyone who wishes to learn Polish fast and easy. It is perfect for beginners and advanced users. Recommended for those who wish to travel to Poland.
Features:
*High quality translations made by Polish
*Create your own favorite list
*No Internet connection needed

What's new in version 6.0 -added the option to hide foreign text before clicking on a sentence
-fixed some bugs that made the app crash