ConfigTool: General Widget update

Fix #539

Tasks:
- [x] Update General widget look to match mock-up
- [x] Implement "Help us translate" button functionality
- [x] Implement "Reset to defaults" button functionality
- [x] Implement "Clear talks" button functionality (Removed after feedback)
- [x] Add confirmation dialog to both(?) reset buttons
- [x] Add translation code for new labels
@mtomwing I didn't actually add this code. I just moved it from where it was in the "General" section to the "AV" section because it's now in the Recording tab. I can still modify it though if you feel it's necessary.