[react-i18n] Specify default locale to babel plugin

[nimzco]

Overview

When using the babel plugin the default locale used is en. It would be nice to specify defaultLocale as an option to the babel plugin so that it fallbacks to French by default instead of English.

Motivation

The app's default locale I am currently working on is French, hence, we will start by having fr.json files before translating them to English.

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[GoodForOneFare]

@nimzco - does your team have bandwidth to contribute a PR for this feature? Web Foundation would be happy to provide guidance and code review.

[nimzco]

Hey @GoodForOneFare, my team doesn't, but I might have some bandwidth during the holiday. 😇The change seems pretty straightforward, I had started to have a look into it. The only wall I am hitting is how to test locally. I run into stupid configuration problem (and it's definitely not something that I enjoy..!) Maybe you have tips to test changes in the babel plugin in isolation?

I'll try something and see if I can get a PR up, we can go from there then.

On a side note, do you know by any chance if react-i18n could be plugged with something like PhraseApp since I know the team did some research, maybe you have this info already. 😇

[nimzco]

Ha! Old habits! 😄

Here's a PR if you want to have a look: https://github.com/Shopify/quilt/pull/1225/files