Internationalization (i18n) and localization (l10n) strategy, string externalization, plural and gender handling, right-to-left text support, cultural adaptation, translation workflow, locale-specific testing. Use when adding multi-language support, managing translations, or expanding to new locales.
Scanned 9/7/2026
Install to Claude Code
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---
name: skill-localization
description: Internationalization (i18n) and localization (l10n) strategy, string externalization, plural and gender handling, right-to-left text support, cultural adaptation, translation workflow, locale-specific testing. Use when adding multi-language support, managing translations, or expanding to new locales.
version: 1.0.0
---
# Skill: Localization (i18n/l10n)
String externalization + translation workflow + cultural adaptation = global product.
## String Externalization
**Don't embed strings in code**:
```python
# ✗ Bad
message = "Hello, " + user.name
# ✓ Good (externalizable)
message = t("greeting", name=user.name)
```
## Translation File Format
```yaml
# locales/en.yaml
greeting: "Hello, {name}"
hello_world: "Hello, World!"
# locales/es.yaml
greeting: "Hola, {name}"
hello_world: "¡Hola, Mundo!"
# locales/fr.yaml
greeting: "Bonjour, {name}"
hello_world: "Bonjour, le monde!"
```
## Pluralization
```
messages:
en:
item_count:
one: "You have 1 item"
other: "You have {count} items"
es:
item_count:
one: "Tienes 1 artículo"
other: "Tienes {count} artículos"
```
## Right-to-Left (RTL) Support
```html
<!-- Auto-detect -->
<html dir="auto">
...
</html>
<!-- or explicit -->
<html lang="ar" dir="rtl">
<!-- Arabic content -->
</html>
<!-- CSS -->
body {
direction: rtl;
text-align: right;
}
```
## Dates & Times
```
en-US: 01/15/2024
en-GB: 15/01/2024
de-DE: 15.01.2024
```
Use locale-aware formatting:
```python
from babel.dates import format_date
format_date(date, format='medium', locale='de_DE')
```
## Translation Workflow
1. **Extract**: Find translatable strings
2. **Upload**: To translation platform (Crowdin, Transifex)
3. **Translate**: Humans + review
4. **Download**: Translated files
5. **Test**: Each locale
6. **Deploy**: With fallback to English
---
**Status**: Ready for localization work
**Best for**: i18n implementation, translation management, global expansion
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