MCPInstall

localization-testing

Internationalization (i18n) and localization (l10n) testing for global products including translations, locale formats, RTL languages, and cultural appropriateness. Use when launching in new markets or building multi-language products.

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/proffesor-for-testing/agentic-qe --skill localization-testing
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads localization-testing automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Localization & Internationalization Testing

Browser engine

Browser-driven locale checks (RTL layout diffs, language-switching flows, locale-specific screenshots) should go through the qe-browser fleet skill. Example:

vibium go "$BASE_URL?lang=ar"  # Arabic, RTL
vibium wait load
node .claude/skills/qe-browser/scripts/visual-diff.js --name homepage-ar-rtl
vibium go "$BASE_URL?lang=ja"  # Japanese, CJK text expansion
node .claude/skills/qe-browser/scripts/visual-diff.js --name homepage-ja

See .claude/skills/qe-browser/SKILL.md for the full reference.

<default_to_action> When testing multi-language/region support:

  1. VERIFY translation coverage (all strings translated)
  2. TEST locale-specific formats (date, time, currency, numbers)
  3. VALIDATE RTL layout (Arabic, Hebrew)
  4. CHECK character encoding (UTF-8, unicode)
  5. CONFIRM cultural appropriateness (icons, colors, content)

Quick i18n Checklist:

  • All user-facing strings externalized
  • No hardcoded text in code
  • Date/time/currency formatted per locale
  • RTL languages flip layout correctly
  • Unicode characters display properly

Critical Success Factors:

  • Don't hardcode strings - externalize everything
  • Test with real speakers, not just translation files
  • RTL requires mirrored UI layout </default_to_action>

Quick Reference Card

When to Use

  • Launching in new markets
  • Adding language support
  • Before international releases
  • After UI changes

Translation Coverage Testing

test('all strings are translated', () => {
  const enKeys = Object.keys(translations.en);
  const frKeys = Object.keys(translations.fr);
  const esKeys = Object.keys(translations.es);

  // All locales have same keys
  expect(frKeys).toEqual(enKeys);
  expect(esKeys).toEqual(enKeys);
});

test('no missing translation placeholders', async ({ page }) => {
  await page.goto('/?lang=fr');
  const text = await page.textContent('body');

  // Should not see placeholder keys
  expect(text).not.toContain('translation.missing');
  expect(text).not.toMatch(/\{\{.*\}\}/); // {{key}} format
});

Date/Time/Currency Formats

test('date formats by locale', () => {
  const date = new Date('2025-10-24');

  expect(formatDate(date, 'en-US')).toBe('10/24/2025');
  expect(formatDate(date, 'en-GB')).toBe('24/10/2025');
  expect(formatDate(date, 'ja-JP')).toBe('2025/10/24');
});

test('currency formats by locale', () => {
  const amount = 1234.56;

  expect(formatCurrency(amount, 'en-US', 'USD')).toBe('$1,234.56');
  expect(formatCurrency(amount, 'de-DE', 'EUR')).toBe('1.234,56 €');
  expect(formatCurrency(amount, 'ja-JP', 'JPY')).toBe('¥1,235');
});

RTL (Right-to-Left) Testing

test('layout flips for RTL languages', async ({ page }) => {
  await page.goto('/?lang=ar'); // Arabic

  const dir = await page.locator('html').getAttribute('dir');
  expect(dir).toBe('rtl');

  // Navigation should be on right
  const nav = await page.locator('nav');
  const styles = await nav.evaluate(el =>
    window.getComputedStyle(el)
  );
  expect(styles.direction).toBe('rtl');
});

test('icons/images appropriate for RTL', async ({ page }) => {
  await page.goto('/?lang=he'); // Hebrew

  // Back arrow should point right in RTL
  const backIcon = await page.locator('.back-icon');
  expect(await backIcon.getAttribute('class')).toContain('rtl-flipped');
});

Unicode Character Support

test('supports unicode characters', async ({ page }) => {
  // Japanese
  await page.fill('#name', '山田太郎');
  await page.click('#submit');

  const saved = await db.users.findOne({ /* ... */ });
  expect(saved.name).toBe('山田太郎');

  // Arabic
  await page.fill('#name', 'محمد');
  // Emoji
  await page.fill('#bio', '👋🌍');

  expect(saved.bio).toBe('👋🌍');
});

Agent-Driven Localization Testing

// Comprehensive localization validation
await Task("Localization Testing", {
  url: 'https://example.com',
  locales: ['en-US', 'fr-FR', 'de-DE', 'ja-JP', 'ar-SA'],
  checks: ['translations', 'formats', 'rtl', 'unicode'],
  detectHardcodedStrings: true
}, "qe-test-generator");

// Returns:
// {
//   locales: 5,
//   missingTranslations: 3,
//   formatIssues: 1,
//   rtlIssues: 0,
//   hardcodedStrings: ['button.submit', 'header.title']
// }

Agent Coordination Hints

Memory Namespace

aqe/localization-testing/
├── translations/*       - Translation coverage
├── formats/*            - Locale-specific formats
├── rtl-validation/*     - RTL layout checks
└── unicode/*            - Character encoding tests

Fleet Coordination

const l10nFleet = await FleetManager.coordinate({
  strategy: 'localization-testing',
  agents: [
    'qe-test-generator',   // Generate l10n tests
    'qe-test-executor',    // Execute across locales
    'qe-visual-tester'     // RTL visual validation
  ],
  topology: 'parallel'
});

Related Skills

  • accessibility-testing - Language accessibility
  • compatibility-testing - Cross-platform i18n
  • visual-testing-advanced - RTL visual regression

Remember

With Agents: Agents validate translation coverage, detect hardcoded strings, test locale-specific formatting, and verify RTL layouts automatically across all supported languages.

FAQ

What does the localization-testing skill do?

Internationalization (i18n) and localization (l10n) testing for global products including translations, locale formats, RTL languages, and cultural appropriateness. Use when launching in new markets or building multi-language products.

How do I install localization-testing?

Run npx skills add https://github.com/proffesor-for-testing/agentic-qe --skill localization-testing in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/localization-testing/ (personal) or .claude/skills/localization-testing/ (project).

Which AI agents can use localization-testing?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is localization-testing safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains localization-testing?

It is published by proffesor-for-testing in proffesor-for-testing/agentic-qe. It has 130 recorded installs.

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