i18n-expert

This skill should be used when setting up, auditing, or enforcing internationalization/localization in UI codebases (React/TS, i18next or similar, JSON locales), including installing/configuring the i18n framework, replacing hard-coded strings, ensuring en-US/zh-CN coverage, mapping error codes to localized messages, and validating key parity, pluralization, and formatting.

1.00x

Quality

88%

Does it follow best practices?

Impact

98%

1.00x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Evaluation results

96%

-3%

Add Internationalization to a React SaaS Dashboard

i18n framework setup and library selection

Criteria

Without context

With context

Correct library

100%

Provider wired at root

87%

75%

Nested namespace keys

100%

Both locales present

100%

No extra locales

100%

Language switcher

100%

Language persistence

100%

t() call syntax

100%

87%

Aria-label localized

100%

90%

Keys in sync

100%

Localize Error Handling in a React Checkout Flow

Error code localization and safe error handling

Criteria

Without context

With context

No raw error.message in UI

100%

Error code mapping

100%

Unknown error fallback

100%

Raw error logged not shown

100%

errors.* namespace in locale

100%

Both locales have error keys

100%

Existing keys preserved

100%

Technical terms untranslated

100%

Complete an Incomplete i18n Migration for a React App

i18n audit, string replacement, and locale validation

Criteria

Without context

With context

Audit script used

100%

Final audit clean

100%

Plural t() syntax

100%

_one/_other plural keys

100%

Aria-label localized

100%

Hardcoded strings replaced

100%

Locale parity

100%

Placeholder syntax preserved

100%

Date/number formatting

50%

100%

Nested namespace kept

100%

Repository: daymade/claude-code-skills
Commit: 392d34c

Evaluated: about 1 month ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Add Internationalization to a React SaaS Dashboard Localize Error Handling in a React Checkout Flow Complete an Incomplete i18n Migration for a React App

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