feat: add i18n support to My Account components

[caetano-vtex]

Introduce react-intl-based internationalization across all My Account components, including new LocaleSelector, MyAccountIntlProvider, and locale message files for en-US and pt-BR.

Made-with: Cursor

What's the purpose of this pull request?

My Account components had all user-facing strings hardcoded in English, making it impossible to serve shoppers in other languages. This PR lays the i18n foundation for the My Account area — enabling merchants to reach customers in their native language, starting with English and Brazilian Portuguese.

How it works?

This PR introduces a react-intl-based internationalization layer wrapping the entire My Account section:

• MyAccountIntlProvider — a context provider that wraps all My Account components with react-intl's IntlProvider. It reads the active locale from a useMyAccountLocale hook and resolves the matching message bundle (en-US or pt-BR), falling back to English when no match is found.
• LocaleSelector — a native <select> component (with a data-fs-locale-selector attribute for styling) that lets users switch between supported locales at runtime. It is rendered inside MyAccountHeader.
• Message bundles — two JSON files (en-US.json and pt-BR.json) covering all translatable strings across the My Account area: navigation menu, profile, security, orders list, order details (status, summary, payment, delivery, budgets, buying policy alerts), and user details.
• All existing My Account components have been updated to consume strings via useIntl().formatMessage() instead of hardcoded literals, covering components such as MyAccountListOrders, MyAccountOrderDetails, MyAccountStatusCard, MyAccountBuyingPolicyAlert, MyAccountPaymentCard, and more.

How to test it?

• Navigate to the My Account area of the storefront.
• Use the language selector in the header to switch between English and Português.
• Verify that all labels, buttons, status names, and messages update to the selected language without a page reload.
• Check the Orders list and open an Order Details page — confirm statuses, payment info, delivery info, and buying policy alerts all render in the selected language.
• Switch locales while a modal (e.g. cancel order confirmation) is open and confirm it re-renders correctly.

Starters Deploy Preview

NA

References

• react-intl documentation
• Conventional Commits

Checklist

PR Title and Commit Messages

• PR title and commit messages follow the Conventional Commits specification
  • Available prefixes: feat, fix, chore, docs, style, refactor, ci and test

PR Description

• Added a label according to the PR goal - breaking change, bug, contributing, performance, documentation..

Dependencies

• Committed the pnpm-lock.yaml file when there were changes to the packages

Documentation

• PR description
• For documentation changes, ping @Mariana-Caetano to review and update (Or submit a doc request)

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