MCPInstall

i18n-localization

by davila7

Internationalization and localization patterns. Detecting hardcoded strings, managing translations, locale files, RTL support.

Installs
568
Last 24h
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Security
Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/davila7/claude-code-templates --skill i18n-localization
  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 i18n-localization 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.

i18n & Localization

Internationalization (i18n) and Localization (L10n) best practices.

1. Core Concepts

TermMeaning
i18nInternationalization - making app translatable
L10nLocalization - actual translations
LocaleLanguage + Region (en-US, tr-TR)
RTLRight-to-left languages (Arabic, Hebrew)

2. When to Use i18n

Project Typei18n Needed?
Public web app✅ Yes
SaaS product✅ Yes
Internal tool⚠️ Maybe
Single-region app⚠️ Consider future
Personal project❌ Optional

3. Implementation Patterns

React (react-i18next)

import { useTranslation } from 'react-i18next';

function Welcome() {
  const { t } = useTranslation();
  return <h1>{t('welcome.title')}</h1>;
}

Next.js (next-intl)

import { useTranslations } from 'next-intl';

export default function Page() {
  const t = useTranslations('Home');
  return <h1>{t('title')}</h1>;
}

Python (gettext)

from gettext import gettext as _

print(_("Welcome to our app"))

4. File Structure

locales/
├── en/
│   ├── common.json
│   ├── auth.json
│   └── errors.json
├── tr/
│   ├── common.json
│   ├── auth.json
│   └── errors.json
└── ar/          # RTL
    └── ...

5. Best Practices

DO ✅

  • Use translation keys, not raw text
  • Namespace translations by feature
  • Support pluralization
  • Handle date/number formats per locale
  • Plan for RTL from the start
  • Use ICU message format for complex strings

DON'T ❌

  • Hardcode strings in components
  • Concatenate translated strings
  • Assume text length (German is 30% longer)
  • Forget about RTL layout
  • Mix languages in same file

6. Common Issues

IssueSolution
Missing translationFallback to default language
Hardcoded stringsUse linter/checker script
Date formatUse Intl.DateTimeFormat
Number formatUse Intl.NumberFormat
PluralizationUse ICU message format

7. RTL Support

/* CSS Logical Properties */
.container {
  margin-inline-start: 1rem;  /* Not margin-left */
  padding-inline-end: 1rem;   /* Not padding-right */
}

[dir="rtl"] .icon {
  transform: scaleX(-1);
}

8. Checklist

Before shipping:

  • All user-facing strings use translation keys
  • Locale files exist for all supported languages
  • Date/number formatting uses Intl API
  • RTL layout tested (if applicable)
  • Fallback language configured
  • No hardcoded strings in components

Script

ScriptPurposeCommand
scripts/i18n_checker.pyDetect hardcoded strings & missing translationspython scripts/i18n_checker.py <project_path>

FAQ

What does the i18n-localization skill do?

Internationalization and localization patterns. Detecting hardcoded strings, managing translations, locale files, RTL support.

How do I install i18n-localization?

Run npx skills add https://github.com/davila7/claude-code-templates --skill i18n-localization 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/i18n-localization/ (personal) or .claude/skills/i18n-localization/ (project).

Which AI agents can use i18n-localization?

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 i18n-localization 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 i18n-localization?

It is published by davila7 in davila7/claude-code-templates. It has 568 recorded installs.

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