Release 1.11.1+54

Fixes:
* Fix thread safety for RxJava subjects across all notifier classes
* Fix race conditions in TestStateModifier database operations
* Fix memory leak from nested RxJava subscriptions in CardItemSV and NotificationTimerItemSV
* Fix CompositeDisposable leak in DeckItemSV, HomePage, and timer detail dialog

Feature:
* Add translations for German, French, Italian, Romansh, Icelandic, Estonian, Norwegian Bokmål, and Norwegian Nynorsk