Bugfixes

[tatsuz0u]

1. fix: Blank screen when receiving empty galleries array.
2. fix: The confirmation dialog presents twice sometimes.
3. fix: Some events not getting handled when the app becomes active.
4. fix: The username text field prevent using the Chinese keyboard. @EthanChinCN
5. refactor: Tweak the the detail list cell a little bit.
6. refactor: Hide the keyboard after tapping login button.
7. refactor: Replace literal browsing country with localized version.