Not really a bug, just a mistake. Cats purring does not appear in the subtitles box.

Put the summary of the bug you're having here

What I expected to happen was...:
The subtitles would say "Cat purring" or something along those lines.

What actually happened was...: Nothing appeared in the subtitles.
 Steps to Reproduce: Get a cat to lay down on a bed, and turn on subtitles. The cat purring will not appear in the subtitles box.

1. Get a cat, turn on subtitles.
2. Make it lay down on a bed.
3. You will notice that the cat purring does not appear in the subtitles in the bottom right corner.