You can change the languages in which to display and read the Quran (by default, the Quran is shown in Arabic, phonetics as well as a translation language based on the language of your device).
To change the translation languages for the Quran :
1- Go on the Quran page and click on any Surah
2- Click on the "Aa" icon
3- Click on the "Flag" or language icon
4- Choose the translation you wish to use
5- Download the translation
6- The translation is now automatically installed after download