Recent Unlocks Activity: Don't show time info in headers and instead display time in items themselves
Decrease text sizes in various item layouts
Redesign

- Completely redesign UI making it as close as possible to Google’s new Material style
- Fix some issues with the Level Picker Dialog in radicals, kanji and vocabulary
- Show remaining times as X minutes, X hours, X days, X months and create leave a preference for using specific dates/times
- Fix Browser not being able to load radicals because of malformatted radical name
- Properly implement vacation mode
- And many many other small fixes and detail improvements