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i18n-l10n

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Mis à jour21 juin 2026 à 08:29

Internationalizes and localizes products — strings, locales, formats, RTL, and translation workflow. Use when adding languages, fixing locale bugs, or expanding to non-English markets.

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vindreshsingh

vindreshsingh/engineering-skills

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Métiers associésSOC

Basé sur la classification professionnelle SOC

Concepteurs web et d'interfaces numériquesProfessions informatiques et mathématiques·SOC 15-1255

SKILL.md

readonly

name	i18n-l10n
description	Internationalizes and localizes products — strings, locales, formats, RTL, and translation workflow. Use when adding languages, fixing locale bugs, or expanding to non-English markets.

i18n / l10n

English-only caps your market. i18n (internationalization) makes the app locale-ready; l10n (localization) delivers each language correctly — including dates, numbers, currency, and layout direction.

Pairs with [[ui-craft]] for UI implementation, [[accessibility]] for RTL and language attributes, [[technical-writing]] for translated docs, and [[test-first]] for locale-specific tests.

When to Use

Adding a second language
Hard-coded strings in UI or API errors
Date/number/currency shown wrong in non-US locales
RTL language support (Arabic, Hebrew)
Translation workflow for releases

Skip for internal English-only tools with documented scope.

Process

1. Choose i18n architecture

Approach	Best for
Key-based JSON/PO files	Web (react-i18next, next-intl)
Platform native (Android strings.xml, iOS Localizable.strings)	Mobile
DB-backed strings	CMS-heavy, frequent copy changes

Rule: no user-facing string literals in components after i18n pass.

2. Extract and namespace strings

namespace.feature.element
auth.login.title
auth.login.submit
errors.network.timeout

Complete sentences in one key — don't split for grammar across keys
Interpolation for variables: "Hello, {{name}}"
Pluralization keys per ICU/plural rules

3. Locale formatting

Centralize:

Dates and times (timezone-aware)
Numbers and decimals
Currency (ISO 4217)
Relative time ("2 hours ago")

Test with de-DE, ja-JP, ar-SA at minimum.

4. RTL and layout

dir="rtl" on <html> or root when locale is RTL
Mirror icons that imply direction (arrows, back)
Don't mirror logos or media with text
Test [[accessibility]] with screen reader in target language

5. Translation workflow

Export strings (JSON/XLIFF)
Translate — human for marketing copy, MT+review for UI chrome OK
Import and verify in UI (pseudo-locale for overflow: [[!!]])
Lock strings before release; changelog for copy changes

6. Test per locale

All screens render without truncation/overflow
Plural forms correct (1 item vs 5 items)
Error messages translated
SEO: hreflang tags if public web ([[seo-growth]])

Common Rationalizations

"We'll translate when we have users there" — Retrofit i18n costs 3–5x vs building in.
"Google Translate in the UI" — Quality breaks trust; use proper workflow.
"English URLs are fine" — hreflang and locale paths matter for SEO.

Red Flags

Concatenated strings: "Hello " + name
Dates hard-coded as MM/DD/YYYY
Icons not mirrored in RTL
Missing translations fall back to empty string
Legal/compliance text machine-translated only

Verification

No hard-coded user-facing strings in changed files
Keys namespaced; plurals and interpolation correct
Formatting uses locale APIs
RTL tested if applicable
Translation export/import process documented
At least one non-English locale verified in browser

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