Translate Skill

Manages translation files in apps/frontend/src/i18n/languages/.

Translation Files

• 15 languages: en (source), de, es, fr, hi, it, ja, ko, nl, pt, sv, tr, tw, vi, zh
• Format: flat JSON key-value pairs (keys = English phrases)
• Interpolation: {{variableName}}
• Library: react-i18next configured in apps/frontend/src/i18n/index.tsx
• Language list defined in apps/frontend/src/i18n/index.tsx (languages array)

When Adding New Translation Keys

1. Add the new key to en.json with the English value
2. Add the same key to ALL other language files with the correct translation for the language of the file
3. After adding to all files, sort ALL translation files alphabetically by key (case-insensitive)

When Removing Translation Keys

1. Remove the key from ALL 15 language files
2. Files should remain sorted after removal

Sorting Rules

• All translation JSON files MUST have keys sorted alphabetically (case-insensitive)
• Sorting applies to ALL language files, not just en.json
• After any modification, verify keys are sorted

Sort Procedure

For each .json file in apps/frontend/src/i18n/languages/:

1. Parse the JSON
2. Get all keys and sort them case-insensitively
3. Rebuild the object with sorted keys
4. Write back with 2-space indentation and trailing newline

Use a Node.js script or jq to sort. Example with Node.js:

node -e "
const fs = require('fs');
const glob = require('glob');
const files = glob.sync('apps/frontend/src/i18n/languages/*.json');
files.forEach(f => {
  const obj = JSON.parse(fs.readFileSync(f, 'utf8'));
  const sorted = Object.keys(obj)
    .sort((a, b) => a.localeCompare(b, undefined, { sensitivity: 'base' }))
    .reduce((acc, key) => { acc[key] = obj[key]; return acc; }, {});
  fs.writeFileSync(f, JSON.stringify(sorted, null, 2) + '\n');
});
"

Sync Check

After any translation change, verify:

• en.json has all keys that exist in code (search for t("...") usage)
• All non-English files have the EXACT same keys as en.json
• Missing keys in non-English files get the correct translation for the language of the file
• Extra keys in non-English files (not in en.json) should be removed
• All files are sorted alphabetically by key

Fixed Words

See apps/frontend/src/i18n/fixedWords.json. Grouped by language code ("all" applies to every language).

Two use cases:

1. Untranslated words — value equals the English word (e.g. "round": "round" keeps "round" in English for Italian)
2. Fixed translations — value is the mandatory translation for that concept (e.g. "endorsement": "supporto" means always use "supporto" for endorsement in Italian)

When translating, ALWAYS check this file first. If a word has a fixed translation for the target language, use it consistently in every sentence.

VeChain Kit: bi-directional language sync

If the app uses @vechain/vechain-kit, keep Kit UI language in sync with the host app:

• App → Kit: Inside VeChainKitProvider, subscribe to i18n.on("languageChanged", ...) and call setLanguage(lng) from useCurrentLanguage() so when the user changes language in the app (e.g. footer selector), Kit updates.
• Kit → App: Pass language={i18n.language} and onLanguageChange={(lng) => i18n.changeLanguage(lng)} into VeChainKitProvider so when the user changes language in Kit (e.g. wallet modal), the app updates.

See the vechain-kit skill reference translations-vechain-kit.md for the full implementation pattern.

Pre-commit and ESLint (missing / unused keys)

• Unused keys in en.json: Run a script that finds keys in en.json never used in code (t("..."), i18nKey="...") and exit non-zero so pre-commit fails. Run when en.json or code is staged.
• Missing keys in other locales: Run a script that compares each locale's keys to en.json and fails if any locale has missing or extra keys. Run when any translation file is staged or in CI.
• ESLint: Optionally add eslint-plugin-i18next (or similar) to flag missing keys in the editor/lint.

See the vechain-kit skill reference translations-vechain-kit.md for a short summary table.