internationalization-i18n
Implement internationalization (i18n) and localization including message extraction, translation catalogs, pluralization rules, date/time/number formatting, RTL language support, and i18n libraries like i18next and gettext. Use for multi-language, translation, or localization needs.
- Installs
- 634
- Last 24h
- —
- Trending rank
- —
- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill internationalization-i18n- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads internationalization-i18n automatically when relevant.
- 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.
Internationalization (i18n) & Localization
Table of Contents
Overview
Comprehensive guide to implementing internationalization and localization in applications. Covers message translation, pluralization, date/time/number formatting, RTL languages, and integration with popular i18n libraries.
When to Use
- Building multi-language applications
- Supporting international users
- Implementing language switching
- Formatting dates, times, and numbers for different locales
- Supporting RTL (right-to-left) languages
- Extracting and managing translation strings
- Implementing pluralization rules
- Setting up translation workflows
Quick Start
Minimal working example:
// i18n.ts
import i18next from "i18next";
import Backend from "i18next-http-backend";
import LanguageDetector from "i18next-browser-languagedetector";
await i18next
.use(Backend)
.use(LanguageDetector)
.init({
fallbackLng: "en",
debug: process.env.NODE_ENV === "development",
interpolation: {
escapeValue: false, // React already escapes
},
backend: {
loadPath: "/locales/{{lng}}/{{ns}}.json",
},
detection: {
order: ["querystring", "cookie", "localStorage", "navigator"],
caches: ["localStorage", "cookie"],
},
});
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| i18next (JavaScript/TypeScript) | i18next (JavaScript/TypeScript) |
| React-Intl (Format.js) | React-Intl (Format.js) |
| Python i18n (gettext) | Python i18n (gettext) |
| Date and Time Formatting | Date and Time Formatting |
| Number and Currency Formatting | Number and Currency Formatting |
| Pluralization Rules | Pluralization Rules |
| RTL (Right-to-Left) Language Support | RTL (Right-to-Left) Language Support |
| Translation Management | Translation Management |
| Locale Detection | Locale Detection |
| Server-Side i18n | Server-Side i18n |
Best Practices
✅ DO
- Extract all user-facing strings to translation files
- Use ICU message format for complex messages
- Support pluralization correctly for each language
- Use locale-aware date/time/number formatting
- Implement RTL support for Arabic, Hebrew, etc.
- Provide fallback language (usually English)
- Use namespaces to organize translations
- Test with pseudo-localization (ääçćëńţś)
- Store locale preference (cookie, localStorage)
- Use professional translators for production
- Implement translation management workflow
- Support dynamic locale switching
- Use translation memory tools
❌ DON'T
- Hardcode user-facing strings in code
- Concatenate translated strings
- Assume English grammar rules apply to all languages
- Use generic plural forms (one/many) for all languages
- Forget about text expansion (German is ~30% longer)
- Store dates/times in locale-specific formats
- Use flags to represent languages (flag ≠ language)
- Translate technical terms without context
- Mix translation keys with UI strings
- Forget to translate alt text, titles, placeholders
- Assume left-to-right layout
FAQ
What does the internationalization-i18n skill do?
Implement internationalization (i18n) and localization including message extraction, translation catalogs, pluralization rules, date/time/number formatting, RTL language support, and i18n libraries like i18next and gettext. Use for multi-language, translation, or localization needs.
How do I install internationalization-i18n?
Run npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill internationalization-i18n 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/internationalization-i18n/ (personal) or .claude/skills/internationalization-i18n/ (project).
Which AI agents can use internationalization-i18n?
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 internationalization-i18n 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 internationalization-i18n?
It is published by aj-geddes in aj-geddes/useful-ai-prompts. It has 634 recorded installs.
More from aj-geddes/useful-ai-prompts
nodejs-express-server
aj-geddes/useful-ai-prompts
Build production-ready Express.js servers with middleware, authentication, routing, and database integration. Use when creating REST APIs, managing requests/responses, implementing middleware chains, and handling server logic.
code-review-analysis
aj-geddes/useful-ai-prompts
Perform comprehensive code reviews with best practices, security checks, and constructive feedback. Use when reviewing pull requests, analyzing code quality, checking for security vulnerabilities, or providing code improvement suggestions.
rest-api-design
aj-geddes/useful-ai-prompts
Design RESTful APIs following best practices for resource modeling, HTTP methods, status codes, versioning, and documentation. Use when creating new APIs, designing endpoints, or improving existing API architecture.
jenkins-pipeline
aj-geddes/useful-ai-prompts
Build Jenkins declarative and scripted pipelines with stages, agents, parameters, and plugins. Implement multi-branch pipelines and deployment automation.
architecture-diagrams
aj-geddes/useful-ai-prompts
Create system architecture diagrams using Mermaid, PlantUML, C4 model, flowcharts, and sequence diagrams. Use when documenting architecture, system design, data flows, or technical workflows.
ansible-automation
aj-geddes/useful-ai-prompts
Infrastructure automation and configuration management using Ansible playbooks, roles, and inventory. Use for deploying applications, patching, and managing servers.
Popular docs & writing skills
grill-with-docs
mattpocock/skills
A relentless interview to sharpen a plan or design, which also creates docs (ADR's and glossary) as we go.
lark-markdown
open.feishu.cn
飞书 Markdown：查看、创建、上传、编辑和比较飞书中的原生 Markdown 文件。当用户要操作飞书 Markdown 文件，或比较其远端版本及本地草稿时使用。纯本地 Markdown 文件操作不触发本 skill。不负责将 Markdown 导入为飞书在线文档，也不负责文件搜索、权限、评论、移动、删除等云空间管理操作。
writing-beats
mattpocock/skills
Writing, exploit; assemble raw material into a journey of beats, grounding each term before a beat leans on it.
writing-shape
mattpocock/skills
Writing, exploit: shape raw material into an article, paragraph by paragraph.
writing-fragments
mattpocock/skills
Writing, explore: mine raw fragments, no structure yet.
writing-for-agents
mattpocock/skills
Writing documents for agents. Use when creating or editing skills, or modifying AGENTS.md or CLAUDE.md.