More fixes/features for the observations flow:

- Fix bug with uploading photos
- Rotate camera photos to the correct direction, Android
- Make sure observed_on_string uses correct timezone
- Remove id and comment buttons from data tab
- Allow user to delete observations; add save dialog; fix updating ids in ObsEdit
- Allow individual uploads & add sync functionality to ObsList
- Hide camera flash if device doesn't have flash
- Update user locale
- Fix repeating photo gallery results on Android
