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Resolve "Initialize default local currency based on locale"

Mateus Dal Bianco requested to merge 430-currency-from-locale into staging

Closes #430

  • Adds a list of countries in the Euro zone (since the currency list maps the Euro to the "EU" country code)
  • Modifies the initialization of the preferences reducer to call a function that gets the device locale via Device.getLanguageTag and tries to map it with a currency in the list, otherwise just uses the current default

Notes

  • The device locale used in this implementation typically refers to the language used in a given region (see IETF BCP 47), and may not always reflect the currency correctly. I personally have en-GB on my laptop for some reason, and that maps to GBP, even though I'm not in a GBP country.
  • As with Euro, there might be items in the list that use a code that is not a country itself, thus would never show up in the locale string and not be matched. If we are aware of those, we should include additional lists and map accordingly.

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