Re: [w3c/manifest] Add support for defining a theme color for both light & dark modes (prefers color scheme) (#975)

I like the idea of aligning this and translations. The current [proposal](https://github.com/WICG/manifest-incubations/blob/gh-pages/translations-explainer.md) for translations is an object with the languages as keys and an object containing the translated members as the values:
```
"translations": {
    "fr": {
      "name": "Bon chien",
      "description": "Une application pour chiens",
      "icons": [],
      "screenshots": []
    }
  },
```

The main difference between translations and user preferences is that order matters for user preferences but not translations. So the translations proposal wouldn’t suit user preferences unless we rely on the JSON object being ordered (which probably isn’t a good idea as discussed earlier in the thread). I think this context/redefine proposal works well for both.

This design also allows more fields to be added later alongside context and redefine. I’m not sure what (if anything) would be added but I think it’s good to have the option.

We could also allow the context string to have multiple comma separated values to reduce duplication. (eg `“context”: “en-AU, en-NZ”`).

I think we shouldn’t allow overlap between the members that can be redefined in translations and user preferences, otherwise we need to figure out what happens if something is defined in both.


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