internationalization-helper
Extracts hardcoded strings for i18n, manages translation files, and ensures locale coverage. Use when working with multi-language apps, translations, or user mentions i18n, localization, or languages.
Full skill instructions
Helps manage internationalization (i18n) and localization (l10n) in multi-language applications.
JavaScript/React:
Vue:
Python:
Ruby/Rails:
Look for imports, config files, or translation directories.
Search for untranslated text:
// Bad: Hardcoded
<button>Submit</button>
<p>Welcome, {user.name}!</p>
// Good: Translated
<button>{t('common.submit')}</button>
<p>{t('welcome.message', { name: user.name })}</p>
Search patterns:
Exclude: code comments, console.log, test strings
React-i18next format (JSON):
{
"common": {
"submit": "Submit",
"cancel": "Cancel"
},
"welcome": {
"message": "Welcome, {{name}}!"
}
}
Gettext format (.po):
msgid "submit_button"
msgstr "Submit"
msgid "welcome_message"
msgstr "Welcome, %(name)s!"
Best practices:
users.profile.titlecommon.buttons.saveerrors.login.invalid not errors.wrong_passwordCompare locale files to find missing translations:
en.json: 150 keys
es.json: 142 keys (missing 8)
fr.json: 150 keys ✓
Missing in es.json:
- users.profile.bio
- settings.privacy.title
[...]
Different languages have different plural rules:
// react-i18next
t('items', { count: 0 }) // "0 items"
t('items', { count: 1 }) // "1 item"
t('items', { count: 5 }) // "5 items"
// Translation file
{
"items_zero": "{{count}} items",
"items_one": "{{count}} item",
"items_other": "{{count}} items"
}
Use locale-aware formatting:
// Numbers
const price = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD'
}).format(29.99);
// Dates
const date = new Intl.DateTimeFormat('fr-FR').format(new Date());
For Arabic, Hebrew:
direction: rtl;<html dir="rtl">margin-inline-start instead of margin-leftCreate template for new locale:
# Copy keys from base language, empty values
cp locales/en.json locales/de.json
# Mark for translation
templates/i18n-config.js: Configuration examplestemplates/locale-file.json: Translation file template
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