osx: Modified the bottom left screen corner to put the display to sleep.

The start screen saver did not trigger the prompt for password when
activated, which the display to sleep option did.
osx: Imported the Mail section.
osx: Migrated additional default configurations.
osx: Modified the default locale.
osx: Modified the `Kill affected applications`-section.

- Added question before attempting to restart the applications.
- Removed the Terminal application since it would kill the script.

Also, minor adjustment to locale and finder configurations.