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i18n-localization — Claude Code skill: i18n and localization patterns

A Claude skill covering internationalization and localization: translation keys, locale files, RTL layout and a checker script.

Install into Claude Code · claude-code-templates All methods and platforms ↓ 
npx claude-code-templates@latest --skill development/i18n-localization
Open on GitHub

What i18n-localization does

This skill lays out i18n and L10n patterns: why translation keys beat raw text, how to namespace strings by feature, how to keep one language per file. It ships examples for react-i18next, next-intl and Python gettext, a locales/ layout split by language, and a pre-ship checklist.

RTL gets its own section. Logical CSS properties such as margin-inline-start replace margin-left, and icons flip with [dir="rtl"]. A table of common problems maps each one to a fix — missing translations, date and number formatting through Intl, pluralization through ICU. To catch hardcoded strings and missing keys there is scripts/i18n_checker.py, run as python scripts/i18n_checker.py <project_path>.

The skill is limited to Read, Glob and Grep. It finds strings, it does not rewrite them. So plan the actual replacement as a separate step instead of expecting the agent to patch every component for you.

What it helps with

  • spot hardcoded strings across components
  • organize translations into namespaced locale files
  • format dates and numbers per locale
  • add RTL support to an existing layout
  • verify every translation key exists in the locale files

Example prompts for the agent

  • run i18n_checker over the project and list the hardcoded strings left
  • move the text in this component into locale files
  • check whether the layout breaks when switched to RTL

How to install i18n-localization

1claude-code-templates

npx claude-code-templates@latest --skill development/i18n-localization

2Skills CLI (Vercel)

npx skills add davila7/claude-code-templates --skill i18n-localization -a claude-code

3Manually: put the files in place

~/.claude/skills/i18n-localization/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/i18n-localization/

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about i18n-localization

How do I install i18n-localization in Claude?

Use the templates command: npx claude-code-templates@latest --skill development/i18n-localization. Or install with npx skills add davila7/claude-code-templates --skill i18n-localization -a claude-code. The skill then lives at ~/.claude/skills/i18n-localization/SKILL.md.

What does i18n-localization do?

It documents i18n and localization patterns: translation keys, locale files, date and number formatting, RTL. It also includes a script that detects hardcoded strings.

Which tools can the skill use?

Only Read, Glob and Grep. It locates strings and files but does not edit them.

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