GB dialect not working for large numbers

```
julia> spelled_out(4_000_000_000_000_000_001, lang=:en_NZ)
"four quintillion, one"

julia> spelled_out(4_000_000_000_000_000_001, lang=:en_GB)
"four quintillion, one"

julia> spelled_out(4_000_000_000_000_000_001, lang=:en)
"four quintillion, one"
```

Is should be "four quuintillion and one"?