Spree i18n & Localization

Before writing code

Fetch live docs:

Fetch https://spreecommerce.org/docs/developer/core-concepts/translations for the v5+ translation model.
Fetch https://github.com/spree-contrib/spree_i18n (README) for the current locale-pack inventory.
Cross-reference https://guides.rubyonrails.org/i18n.html for Rails-side i18n basics.
Check the v5.4 announcement for Translations Center features.
Verify which locales ship vs. which require the spree_i18n gem on top of spree.

Layer	What it translates
`spree_i18n` gem	UI labels — admin chrome, checkout strings, error messages, attribute names
Translations Center (v5.4+)	Per-record content — product names, descriptions, taxon names, CMS page bodies