Localizer for handling error by request header.

I got problem when trying to implement Huma to existing project with locales support.
The global function: huma.ErrorFormatter and builtin validator is not designed to transform error message & it's details.
Currently, I have to make a little hack by marshal the error context and make another transformer to unmarshal it.
Do you have any idea to deal with it?

`

huma.ErrorFormatter = func(format string, args ...any) string {
var pluralCount any = 1
switch format {
case validation.MsgExpectedMinProperties, validation.MsgExpectedMaxProperties:
pluralCount = args[0]
}
msg, _ := json.Marshal(&validator.ValidationInfo{
ID: fmt.Sprintf("error:validation:%s", strings.ReplaceAll(format, " ", "_")),
Format: format,
Default: fmt.Sprintf(format, args...),
Args: args,
PluralCount: pluralCount,
})
return string(msg)
}`

Start by reviewing Huma's global ErrorFormatter and builtin validator behavior, as well as how the request header is expected to select a locale. The issue does not name files or tests, and completion criteria are not agreed; clarify the design for transforming error messages and details without the marshal/unmarshal workaround.

Written by the indexing model from the issue text.