feat(i18n): add Russian and Ukrainian translations

[TomaszJanusz]

Summary

• Russian- and Ukrainian-speaking users can now use the complete extension interface in their browser language, including popup, settings, rules, sidebar, onboarding, demo, diagnostics, and release notices.
• Added locale catalogs with English key and interpolation parity, natural counter forms for both languages, and coverage for localized release notices and dynamic copy. Product names continue to use the existing branding mechanism. The privacy policy document was not translated.
• Updated the public-boundary audit to accept the English rename title in a multilingual catalog and kept the retired product name confined to its approved English source values.

Validation

• pnpm task lint
• pnpm task check
• pnpm task test:unit
• Both targets still build (pnpm task build:chrome, pnpm task build:firefox)
• Worker bundle regenerated if packages/refract-core changed (pnpm task generate:worker-source) — not applicable; packages/refract-core is unchanged.
• pnpm task format:check
• Focused i18n and release notice tests (39 passed)
• git diff --check
• Public-boundary audit: no mechanical findings

Changelog

• I updated CHANGELOG.md in ## [Unreleased] for user-facing changes.
• This change does not need a changelog entry (internal/test/CI/refactor only).

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Note

Add Russian and Ukrainian UI translations and language selector entries

• Adds complete Russian and Ukrainian catalogs across all UI sections (popup, rules, sidebar, welcome, options, advanced, etc.) and wires them into resolveUiLocale and the locale-to-catalog mapping in index.ts
• Introduces a shared Slavic pluralization helper (slavicPluralForm, slavicCount) in slavic-plural.ts for one/few/many noun forms, used by both locales for notification badges, rule counts, and assignment labels
• Adds Russian and Ukrainian titles and message arrays to the extension notification catalog in extension-notifications.json, and revises some Spanish/Portuguese titles
• Adds Russian and Ukrainian items to the LanguageCard selector in options-preference-sections.tsx and corresponding labels in the English, Spanish, and Portuguese advanced-language sections
• Adds test coverage for locale resolution, plural forms, fragment joining, notification wording, and release-notification catalog completeness
• Risk: the i18n coverage test in i18n-usage.test.ts now hard-fails if the locale set is not exactly English, Spanish, Portuguese, Russian, and Ukrainian; any future locale addition must update this assertion

^{Macroscope summarized 8ff3637.}

Summary by CodeRabbit

• New Features
  • Added complete Russian and Ukrainian translations across the interface, including setup, settings, notifications, and help content. The app selects these languages automatically based on the browser’s interface language.
  • Added Russian and Ukrainian to the available display-language options.
• Updates
  • Updated Spanish and Portuguese notification titles to refer to the extension generically rather than by its former name.

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Review configuration:

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 0f7bc281-30cd-4304-a354-47a5ed095d89

📥 Commits

Reviewing files that changed from the base of the PR and between 9a916e6 and 8ff3637.

📒 Files selected for processing (1)

• src/ui/i18n/uk-sections/welcome.ts

📝 Walkthrough

Walkthrough

The interface now includes Russian and Ukrainian translations, with locale selection based on the browser interface language. The change also adds Slavic pluralization helpers and Russian and Ukrainian translations for release notifications.

Changes

Russian and Ukrainian localization

Layer / File(s)	Summary
Pluralization and translation catalogs src/ui/shared/slavic-plural.ts, src/ui/i18n/slavic-plural.test.ts, src/ui/i18n/*-sections/*, src/ui/i18n/ru.ts, src/ui/i18n/uk.ts, src/ui/i18n/localized-copy.test.ts	Adds Russian and Ukrainian translations across interface sections. Adds Slavic plural-form helpers and tests for pluralization and localized copy.
Locale registration and selection src/ui/i18n/index.ts, src/ui/i18n/index.test.ts, src/ui/i18n/i18n-usage.test.ts, src/ui/i18n/{en,es,pt}-sections/advanced.ts, src/ui/options/components/tabs/options-preference-sections.tsx, CHANGELOG.md	Adds both locales to locale resolution and language options. Updates locale alignment tests and the changelog.
Localized release notifications src/shared/extension-notifications.json, src/shared/release-notification.test.ts, .agents/skills/public-boundary-audit/scripts/audit-public-boundary.mjs	Adds Russian and Ukrainian notification copy, revises Spanish and Portuguese rename-notification copy, and tests locale coverage and message lengths. Updates the audit script’s exact-match line.
Estimated code review effort: 4 (Complex)	~60 minutes

Merge Risk: 🔵 Low · up to 9a916

This change adds Russian and Ukrainian interface and notification translations, selected from the browser language. The only remaining problem is cosmetic: two city names in the Ukrainian onboarding wizard lack their standard hyphens. The change is safe to merge after this small copy fix, or with it as a follow-up.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: adding Russian and Ukrainian translations.
Description check	✅ Passed	The description includes the required Summary, Validation, and Changelog sections. It explains the user-facing changes, records validation results, and marks the worker-bundle step as not applicable b…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Create a new PR

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@src/ui/i18n/uk-sections/welcome.ts`:
- Around line 116-129: Update the Ukrainian labels for spfLasVegas and
spfRioDeJaneiro in the welcome catalog to use the standard hyphenated spellings,
while leaving the other city names unchanged.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: c2d8275b-5048-46a4-90a3-cd68faa1a3b6

📥 Commits

Reviewing files that changed from the base of the PR and between 7e3e23f and 9a916e6.

📒 Files selected for processing (44)

• .agents/skills/public-boundary-audit/scripts/audit-public-boundary.mjs
• CHANGELOG.md
• src/shared/extension-notifications.json
• src/shared/release-notification.test.ts
• src/ui/i18n/en-sections/advanced.ts
• src/ui/i18n/es-sections/advanced.ts
• src/ui/i18n/i18n-usage.test.ts
• src/ui/i18n/index.test.ts
• src/ui/i18n/index.ts
• src/ui/i18n/localized-copy.test.ts
• src/ui/i18n/pt-sections/advanced.ts
• src/ui/i18n/ru-sections/about.ts
• src/ui/i18n/ru-sections/advanced.ts
• src/ui/i18n/ru-sections/common.ts
• src/ui/i18n/ru-sections/demo.ts
• src/ui/i18n/ru-sections/firefox-containers.ts
• src/ui/i18n/ru-sections/locations.ts
• src/ui/i18n/ru-sections/options.ts
• src/ui/i18n/ru-sections/osm.ts
• src/ui/i18n/ru-sections/popup.ts
• src/ui/i18n/ru-sections/rules.ts
• src/ui/i18n/ru-sections/shared-worker.ts
• src/ui/i18n/ru-sections/sidebar.ts
• src/ui/i18n/ru-sections/trusted-sites.ts
• src/ui/i18n/ru-sections/welcome.ts
• src/ui/i18n/ru.ts
• src/ui/i18n/slavic-plural.test.ts
• src/ui/i18n/uk-sections/about.ts
• src/ui/i18n/uk-sections/advanced.ts
• src/ui/i18n/uk-sections/common.ts
• src/ui/i18n/uk-sections/demo.ts
• src/ui/i18n/uk-sections/firefox-containers.ts
• src/ui/i18n/uk-sections/locations.ts
• src/ui/i18n/uk-sections/options.ts
• src/ui/i18n/uk-sections/osm.ts
• src/ui/i18n/uk-sections/popup.ts
• src/ui/i18n/uk-sections/rules.ts
• src/ui/i18n/uk-sections/shared-worker.ts
• src/ui/i18n/uk-sections/sidebar.ts
• src/ui/i18n/uk-sections/trusted-sites.ts
• src/ui/i18n/uk-sections/welcome.ts
• src/ui/i18n/uk.ts
• src/ui/options/components/tabs/options-preference-sections.tsx
• src/ui/shared/slavic-plural.ts

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