Browser description on Google Play

[GRadziejewski]

Description of the Ghostery Privacy Browser needs an update.

Things to update:

• What's new,
• "tracker protection of the Ghostery 8" - should be Ghostery Browser Extension?
• UI Updates - Ghostery Android v3?
• "Bookmark folders" the description seems a bit far fetched, should we delete this part?
• Required OS - do we want to have this updated? Android 5.0 is from 2014-15.

Current one looks like this:

### Tasks
- [ ] https://github.com/ghostery/journal/issues/142
- [ ] https://github.com/ghostery/user-agent-android/issues/37

[yokoffing]

@GRadziejewski We can leave Required OS the same since Firefox on Play Store still only requires Android 5 (or so it says).