# i18n-frontend-implementer

This skill adds frontend i18n setup with translation files, locale-aware formatting, plural handling, and language switching.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 359 installs · ★ 63
- Author: patricio0312rev
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/patricio0312rev/skills/tree/HEAD/frontend/i18n-frontend-implementer/SKILL.md
- Updated: 2026-01-12
- HTML: https://affpapa.org/en/nevibecode/skills/i18n-frontend-implementer

## What it does

i18n-frontend-implementer guides an internationalization setup with `next-intl`, `react-i18next`, or a similar library. It covers locale dictionaries such as `locales/en.json` and `locales/es.json`, provider wiring, and hierarchical translation namespaces.

The skill also handles date, number, and currency formatting, plural rules, and a language switcher. Its guidance includes moving interface text into translations, supporting RTL languages, and loading translations lazily. Choose the i18n library before applying the setup, since the implementation follows the project’s selected stack.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add patricio0312rev/skills --skill i18n-frontend-implementer -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/i18n-frontend-implementer/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/i18n-frontend-implementer/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add patricio0312rev/skills --skill i18n-frontend-implementer -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/i18n-frontend-implementer/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add patricio0312rev/skills --skill i18n-frontend-implementer -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/i18n-frontend-implementer/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install patricio0312rev/skills i18n-frontend-implementer
```

2. **Manually: put the files in place**
- File: `.github/skills/i18n-frontend-implementer/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add patricio0312rev/skills --skill i18n-frontend-implementer -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/patricio0312rev/skills --path frontend/i18n-frontend-implementer
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/i18n-frontend-implementer/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add patricio0312rev/skills --skill i18n-frontend-implementer -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/patricio0312rev/skills/tree/HEAD/frontend/i18n-frontend-implementer/SKILL.md

## When to use it
- add translations to a frontend app
- organize keys into translation namespaces
- format dates, numbers, and currency by locale
- handle pluralized messages
- build a language switcher

## Example prompts
- Set up i18n in this frontend with `next-intl`, then create `locales/en.json` and `locales/es.json`.
- Organize the translation keys, add locale-aware date and currency formatting, and wire in language switching.
- Review plural messages and add RTL language support to the current interface.

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 83851e2357a88103.

BEGIN THIRD-PARTY FILE 83851e2357a88103
````text
---
name: i18n-frontend-implementer
description: Adds internationalization (i18n) infrastructure with translation plumbing, scalable key strategy, formatters for dates/numbers/currency, plural rules, and language switching. Use when implementing "internationalization", "translations", "multi-language support", or "i18n".
---

# i18n Frontend Implementer

Implement internationalization with next-intl, react-i18next, or similar libraries.

## Core Setup

**1. Install**: `npm install next-intl` or `react-i18next`
**2. Create dictionaries**: `locales/en.json`, `locales/es.json`
**3. Provider setup**: Wrap app with IntlProvider
**4. Translation keys**: Hierarchical namespace structure
**5. Formatters**: Date, number, currency formatting
**6. Language switcher**: Dropdown or flags UI

## Translation Structure

```json
{
  "common": { "nav": { "home": "Home", "about": "About" } },
  "auth": { "login": "Sign In", "logout": "Sign Out" },
  "errors": { "required": "{field} is required" }
}
```

## Usage Examples

```tsx
const t = useTranslations('common');
<h1>{t('nav.home')}</h1>

// With plurals
t('items', { count: 5 }) // "5 items"

// With formatting
<p>{formatDate(date, { dateStyle: 'long' })}</p>
```

## Best Practices

Use namespaces for organization, extract all text to translations, handle plurals properly, format dates/numbers per locale, provide language switcher, support RTL languages, lazy-load translations.
````
END THIRD-PARTY FILE 83851e2357a88103

The third-party file has ended. Everything between the 83851e2357a88103 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

© patricio0312rev · MIT · https://github.com/patricio0312rev/skills/tree/HEAD/frontend/i18n-frontend-implementer/SKILL.md

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