Js-lingui: Allow nested JSON messages

[charliedavison]

Is your feature request related to a problem? Please describe.
Allow nested JSON as messages

Describe the solution you'd like
As far as I can tell, the --minimal format flag only accepts a flat structure.

My current translation files are in the format:

```
{
"SystemArea1": {
"Label_1": "Hello world"
}
"SystemArea2": {
"Label_1": "Another message"
}
}
````

Describe alternatives you've considered
I've had to flatten them to work with Lingui. This works but causes unnecessary bloat in the translation file.

I may have missed something but can't see a way of doing this at the moment.

[tricoder42]

Hi @charliedavison,
no, this is not supported at the moment.

If you're interested, feel free to write another file format, e.g: json-nested. I believe this should be pretty easy. Take a look at existing formats here https://github.com/lingui/js-lingui/tree/master/packages/cli/src/api/formats

Just a note: Compiled catalog is always a flat json. There's an planned improvement to minify message IDs #139 though.

[charliedavison]

Thanks for the clarification.

I may well take a look at this one then and submit a PR.

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