Miswritten sounds.json causing almost all 1.13 subtitles to be unshown (Fix included)

Look at the picture.

The blue square is representing the subtitles that were added before 1.13, and the red square is representing the subtitle that were added in 1.13.

As you can see, almost all of the subtitles added in 1.13 are written as "subtitles" not "subtitle", and causing subtitles to be not shown ingame.

Fix JSON included.

Affected sounds

• entity.drowned.ambient
• entity.drowned.death
• entity.drowned.hurt
• entity.drowned.shoot
• entity.drowned.step
• entity.drowned.swim
• entity.husk.converted_to_zombie
• entity.illusioner.ambient
• entity.illusioner.cast_spell
• entity.illusioner.death
• entity.illusioner.hurt
• entity.illusioner.mirror_move
• entity.illusioner.prepare_blindness
• entity.illusioner.prepare_mirror
• entity.skeleton_horse.swim
• entity.squid.squirt
• entity.turtle.ambient_land
• entity.turtle.death
• entity.turtle.death_baby
• entity.turtle.egg_break
• entity.turtle.egg_crack
• entity.turtle.egg_hatch
• entity.turtle.hurt
• entity.turtle.hurt_baby
• entity.turtle.lay_egg
• entity.turtle.shamble
• entity.turtle.shamble_baby
• entity.turtle.swim
• entity.zombie.converted_to_drowned
• item.axe.strip