When is the "audio file not found" message displayed and why is it not on the Interface tab?

On the Audio > Audio Settings tab in SAB, there is a text box where we can enter a message. The description says, “If an audio file is not found on the device and no download is available, what message would you like displayed to the user?”

When is this message displayed to the user? I’m not sure I understand the conditions for this to be displayed. It would help to know what to write for the message.

I ask because on the Interface > Translations tab in SAB, there is a phrase labeled Audio_File_Not_Found that can be edited. There are also a number of other audio related phrases we can provide translations for.

If the message we provide on the Audio > Audio Settings tab is displayed to the user then is there a way we can provide translations for the various interface languages we have enabled?