New: Version 1.5: Fix issue make button check answer being covered and can not be clicked

Version 1.4.2:
- Support Android 8.0 (Oreo)
- Fix bugs

Update version 1.3.1: 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 own word's/phrases definition
- Bookmark words/phrases