There are places in the frontend were we don't use natural sorting. Here's some of them:

• Functions in the trigger pop up
• Icons on the icon configuration page
• Icons in the icon mapping configuration form
• Media type list in the action operation configuration form
• Conditions in the action condition configuration form
• Host groups in the "Group for discovered hosts" drop down in Administration - General
• User groups in the "User group for database down message" drop down in Administration - General
• User groups in the user group selection pop up
• Users in the user group configuration form
• User groups in the "Other groups" drop down in the user group configuration form
• Host groups in the user group permission configuration form
• User groups in the drop down on the user list page
• Host groups in the user permission configuration form

There may be more of them.