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+---
+description: Adding Translations to an Existing File (using useT)
+---
+
+## AI Assistant Workflow — Adding Translations to an Existing File (using `useT`)
+
+This is **not** about adding a new language.
+This is about correctly adding new translation keys to a feature or component that already exists.
+
+Follow this strictly.
+
+---
+
+### 1️⃣ Identify All User-Facing Strings
+
+Scan the file and list every:
+
+- Button label
+- Title
+- Placeholder
+- Tooltip
+- Toast message
+- Modal text
+- Validation error
+- SEO metadata
+- Empty state message
+
+If a string is visible to users, it must be translated.
+
+Do **not** leave inline English in JSX.
+
+Bad:
+
+```tsx
+<button>Delete account</button>
+```
+
+Correct:
+
+```tsx
+<button>{t('settings.delete_account', 'Delete account')}</button>
+```
+
+---
+
+### 2️⃣ Import and Initialize `useT`
+
+At the top of the file:
+
+```tsx
+import {useT} from 'web/lib/locale'
+```
+
+Inside the component:
+
+```tsx
+const t = useT()
+```
+
+No exceptions.
+Do not manually access locale files.
+
+---
+
+### 3️⃣ Replace Hardcoded Strings
+
+Wrap every string in:
+
+```tsx
+t('namespace.key', 'Default English text')
+```
+
+Example:
+
+```tsx
+t('news.seo.description_general', 'All news and code updates for Compass')
+```
+
+Rules:
+
+- First argument = stable translation key
+- Second argument = default English fallback
+- The English text must exactly match what you want displayed
+
+---
+
+### 4️⃣ Naming Convention for Keys
+
+Use structured namespaces.
+
+Good:
+
+```
+profile.delete.confirm_title
+profile.delete.confirm_body
+settings.notifications.email_label
+events.create.submit_button
+```
+
+Bad:
+
+```
+delete1
+buttonText
+labelNew
+```
+
+Keys must be:
+
+- Hierarchical
+- Feature-scoped
+- Predictable
+- Stable (never rename casually)
+
+---
+
+### 5️⃣ Add the Keys to All Existing Locale Files
+
+After updating the component:
+
+1. Open:
+
+   ```
+   web/messages/fr.json
+   web/messages/de.json
+   ...
+   ```
+
+2. Add the new keys to **every language file**
+
+Keys must be identical across all files.
+
+Example:
+
+```json
+{
+  "confirm_title": "Delete account?",
+  "confirm_body": "This action cannot be undone."
+}
+```
+
+Then translate values for non-English files.
+
+---
+
+### 6️⃣ Use an LLM for Draft Translation (Correctly)
+
+When translating large additions:
+
+- Copy only the new JSON section
+- Ask:
+
+```
+Translate the values of the JSON below to French.
+Keep all keys unchanged.
+Return valid JSON only.
+```
+
+Never let the model modify keys.
+
+Then manually review.
+
+LLMs make mistakes:
+
+- Wrong tone
+- Cultural mismatch
+- Broken JSON
+- Overly long mobile labels
+
+You must verify.
+
+---
+
+### 7️⃣ Respect Mobile Constraints
+
+Certain keys must stay short (< 10 characters):
+
+```
+nav.home
+nav.messages
+nav.more
+nav.notifs
+nav.people
+```
+
+If you add navigation items, enforce brevity.
+
+---
+
+### 8️⃣ Handle Variables Properly
+
+For dynamic values:
+
+```tsx
+t('events.count', '{count} events', {count})
+```
+
+Make sure placeholders match across all languages.
+
+Do not concatenate strings manually.
+
+Bad:
+
+```tsx
+'Events: ' + count
+```
+
+Correct:
+
+```tsx
+t('events.count', '{count} events', {count})
+```
+
+---
+
+### 9️⃣ SEO & Metadata
+
+Even SEO descriptions must use translations:
+
+```tsx
+<meta
+  name="description"
+  content={t('profile.seo.description', 'View user profiles and connect with like-minded people.')}
+/>
+```
+
+Do not hardcode metadata.
+
+---
+
+### 10️⃣ Final Verification Checklist
+
+Before committing:
+
+- No visible English strings left
+- All new keys added to all locale files
+- No missing translations warnings
+- JSON is valid
+- Mobile nav labels are short
+- Variables work in all languages
+- No duplicate keys
+- Namespaces are consistent
+
+---
+
+### Example — Full Pattern
+
+```tsx
+import {useT} from 'web/lib/locale'
+
+export default function DeleteModal() {
+  const t = useT()
+
+  return (
+    <>
+      <h2>{t('profile.delete.confirm_title', 'Delete account?')}</h2>
+      <p>{t('profile.delete.confirm_body', 'This action cannot be undone.')}</p>
+      <button>{t('profile.delete.confirm_button', 'Delete')}</button>
+    </>
+  )
+}
+```
+
+---
+
+### Summary
+
+When adding translations to a file:
+
+1. Replace every user-visible string
+2. Use `useT()`
+3. Create structured keys
+4. Add keys to every locale file
+5. Translate values carefully
+6. Validate JSON
+7. Test UI in multiple languages
+
+If you skip any of these steps, you create future maintenance debt.
+
+There is no shortcut.