Use different title at Case Tracker settings page

The patch works well for me, and makes translators' work easier, as they can differentiate the module name and the menu item's title. Anyway, I wouldn't call it a bug.

This appears to be inconsistent with how drupal core behaves. None of the page callbacks core provides in 'admin/settings' seems to have the word 'settings' in the title, rather it's things like "file system" and "error reporting". Based on this I'm hesitant to make this change.