What's happened:

I turned on subtitles (no, i'm not hard-of-hearing), and when wandering trader mumbles, there is appear the string showed on picture in Attachments

WARNING!

I checked other Wandering Trader's sounds, and other sounds in Subtitles are not named correctly! Ex. subtitles.entity.wandering_trader.hurt, .death.

How to reproduce:

1. Turn on subtitles,
2. Come and stand near wandering trader,
3. Wait for his mumble,
4. You will see this string.