What are (were) the most difficult parts of D?

[zjh]

On Friday, 13 May 2022 at 21:54:04 UTC, max haughton wrote:

> I have a PR which alters the error message you get if you do
>
> ```d
> void main()
> {
>   func() == 43;
> }
> ```
>
> This is an example of an error message which could be 
> counterintuitive to a new D programmer,

Can `D` support error messages in `multiple languages`?
Such as `Chinese/German/Russian/Turkey`.