[react-i18n] Pluralization should wait until the locales translations have loaded

Overview

Originally raised over Slack due to this support issue, I noticed that we load in en translations before the selected locales translations:

When using pluralization, for specific count values (the variable for this is PLURALIZATION_KEY_NAME in the Quilt repo) we’ll receive back the fields “few” or “many”. Because we’ve yet to load in the locale-specific translations, we’ll default to the already loaded in en translations. With pluralization the “few” and “many” keys (specific to cs and pl locales) won’t exist in en causing the app to crash.

My proposal is to investigate how we can also fallback on the en pluralization if that locales translations haven’t been loaded in yet. It looks like this can take place somewhere here.

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[jas7457]

@movermeyer I can’t say I know much about that project or the changes that were needed for it, but I’m not working in web, I work on the Shopify Search & Discovery first-party app.

That project makes it sound like they did something specific to web, not something that fixes the root problem for @shopify/react-i18n.

[movermeyer]

@jas7457 My understanding (though I never tested it) was that this was fixed by Bring Locale Specific I18N Builds Over The Finish Line project