Add i18n locales

[cathysarisky]

This PR adds a new locales folder to the shared theme assets. New build tools (see PR in Source repo) will retrieve these locales for assembling a locales file for each theme.

[coderabbitai]

Walkthrough

A new English locale JSON file has been added at packages/_shared/assets/locales/en.json. The file contains key-value pairs for UI strings covering site navigation, post interactions, subscription prompts, and access-related messages. All translation values are currently empty strings awaiting translation content. This is a structural addition for internationalization support with no functional logic changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add i18n locales' directly matches the main change—adding a new locales folder with English locale strings.
Description check	✅ Passed	The description accurately explains the purpose of adding locales and mentions the new build tools that will use them.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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