Fixes before beta4:

- Use hide() instead of unset() for sidbar array.
- E-Mail template now translatable.
- theme_hook_alter() revert to theme_hook() due multiple problmes.
- Responsive menu js code was removed, cuz superfish do the same.
- Fix translation.
- Added developers option to (sub)theme. Now it have three options:
  - Rebuild Theme Registry on every page.
  - Restyle checkboxes.
  - Restyle radios.