[MC-195467] Missing death message "death.fell.accident.water" and its localization

The death message "death.fell.accident.water" and its localization is missing. It is about getting fall damage in water.

Summon a water area using the following command.
```
/fill ~1 ~-1 ~1 ~-1 ~-1 ~-1 minecraft:water
```
Standing in the water, execute the following command provided below.
```
/damage @s 100 fall
```
→ When you die, the death message shown is death.fell.accident.water.

Note that there are also some edge cases where this death message is shown without using commands, though these are more difficult to reproduce.