Add xxhdpi check drawable for notifications

Fixes blurry mark as read icon on Android Wear. FREEBIE.
Merge pull request #1678 from veeti/check-icon

Add xxhdpi check drawable for notifications
use latest android number as recipient number

Fixes #791
// FREEBIE
Update language translations.

// FREEBIE
Bumping version to 2.1.0
use v7 appcompat and remove ABS

// FREEBIE
PassphraseRequiredActionBarActivity and refactoring
indent