Allow pass locale to Duration toHuman

[NogaMan]

Is your feature request related to a problem? Please describe.
We don't have fully localized app yet and are in the process of localizing parts one by one.
That's why we can't use Settings.defaultLocale to set the locale once. Instead we pass locale explicitly where the formats are already localized.
For Duration I see there is no way to set locale before (or at the moment of) calling .toHuman.
That will be great to have that feature

Describe the solution you'd like
Allow passing locale to .toHuman:

Duration.fromDurationLike({ seconds: 12000 })
  .rescale()
  .toHuman({ locale: 'ja' });

and allow to set locale similar to DateTime:

Duration.fromDurationLike({ seconds: 12000 })
  .rescale()
  .setLocale('ja')
  .toHuman();

Describe alternatives you've considered
The alternative is to set default locale globally Settings.defaultLocale = 'ja';, but it wont work for us, as we are not fully localized yet.

[diesieben07]

You can use Duration#reconfigure:

Duration.fromDurationLike({ seconds: 12000 })
  .rescale()
  .reconfigure({ locale: 'ja' })
  .toHuman(); 

// => "3 時間、20 分"

I'll keep this open as a feature request to add Duration.setLocale as a convenience alias for reconfigure (like in DateTime) and to make toHuman accept locale parameters, like similar formatting methods (e.g. DateTime.toLocaleString).

[dasa]

I noticed that all the other Duration.fromX static methods support an opts parameter that includes a locale. e.g., https://moment.github.io/luxon/api-docs/index.html#durationfrommillis

Maybe Duration.fromDurationLike should as well?