The "entity" word I think is wrongly typed in the subtitles "subtitles.enity.generic.explode", when the end gateway spawn.

"subtitles.enity.generic.explode"

I think it should be:

"subtitles.entity.generic.explode"

Steps to reproduce
1. Show Subtitles: ON;
2. Enter the following command:

/playsound minecraft:block.end_gateway.spawn block @a

3. Look at the subtitles.