Add more settings tests and differ tests depending on if isFirefoxOS

Test Plan:
- Run http://localhost:8092/test/test.html
Add UI tests for settings pane

Test Plan:
- Run http://localhost:8092/test/test.html
Move out react testing from other unit tests

Test Plan:
- Run http://localhost:8092/test/test.html
Enable tr and bn for localization tests

Test Plan:
- Run http://localhost:8092/test/test.html
Add translations for v1.1 features

Test Plan:
- None
Add translated strings for Bengali

Test Plan:
- Run tests, make sure everything passes again