*New: Version 2.4.2: Hot fix notification sound issue

Version 2.4.1:
- Support Android 8.0 (Oreo)
- Fix bugs

Version 2.3.1 (#16): Hot fix
- Ability to change text size
- Copy and translate the whole lesson with Google Translate
- Copy and send the whole lesson's text to other apps
- Save the translation
- Copy and send a phrase (multiple words selection)
- Note and save your ownword's/phrases definition
- Bookmark words/phrases

Version 2.2:
- Fix bugs
- Able to remove advertisements