There are two very different translations when deleting a media type and script which both belong to action.

1. Create media type.
2. Create script type.
3. Create action and assign both media type as message and script as remote command to action operation.

Deleting media type will result in error: Media types used by action "%1$s".
However deleting a script will result in different but similar error. Script "%1$s" is used in action operation "%2$s".

Both messages mean same thing, but are written differently. Also notice deleting script the message says "action operation" followed by name of the action. Notice how word "operation" is misleading there.