No, this isn't a modification. You can enable this somewhere in your Vanilla Minecraft client. This feature is mainly intended for players who are hard of hearing, deaf or play with sounds off. They can also be used for hearing quieter sounds.
Interesting, the more you know. TBH i wontered if it was part of the vanilla game but it looks SO similar to a client i decided not to look it up. Thx!!!
Sorry, I was kinda late with this but you can enable those in the sound settings, they're called subtitles. It's very useful for gun servers, but I wouldn't say it's very useful on GTM as you're more in the open, however if you're in a closed building it would be hella useful for the footsteps.
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