Android: Added support for TS Gateway
Merge pull request #1222 from mfleisz/andrtsg

Android: Added support for TS Gateway
Dutch translation v2

Optimized: 'Credentials' translated
Android: Unregister settings changed listener
Merge pull request #1226 from martijn-m/master

Optimized Dutch translation
Merge pull request #1232 from mfleisz/andrfixsettings

Android: Unregister settings changed listener