ThunderAI/claude-spec/06-localization.md

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# Localization
## Golden Rule
**Only ever modify `_locales/en/messages.json`.**
All other locale files (`de`, `fr`, `it`, `es`, `zh_Hans`, `zh_Hant`, `pl`, `ru`, `pt-br`, `sv`, `el`, `cs`, `hr`, `ja`, `nb_NO`) are managed by translators through [Weblate](https://hosted.weblate.org/). Never edit them manually.
## Message File Format
Each entry in `_locales/en/messages.json` follows the standard WebExtension i18n format:
```json
"key_name": {
"message": "The English text",
"description": "Context for translators explaining where/how this string is used"
}
```
The `description` field is important — it helps Weblate translators understand the context.
## Using Strings in Code
### In JavaScript
```javascript
import { i18n } from './mzta-i18n.js';
const text = i18n('key_name');
// or directly:
const text = browser.i18n.getMessage('key_name');
```
### In HTML
```html
<span data-i18n="key_name"></span>
<!-- or via manifest/attribute references: -->
__MSG_key_name__
```
### In manifest.json
```json
"description": "__MSG_extensionDescription__"
```
## Naming Conventions
| Prefix | Usage |
|--------|-------|
| `menu_*` | Context menu and popup menu labels |
| `prompt_*` | Built-in prompt names |
| `placeholder_*` | Placeholder display names |
| `options_*` | Settings page labels |
| `pages_*` | Feature page labels |
| `error_*` | Error messages |
| `info_*` | Informational messages |
| `btn_*` | Button labels |
## Adding a New String
1. Open `_locales/en/messages.json`
2. Add the new key in alphabetical order within the file (or near related keys)
3. Include both `message` and `description` fields
4. Use the string in code via `browser.i18n.getMessage('key_name')` or `__MSG_key_name__`
Example:
```json
"my_new_feature_label": {
"message": "My New Feature",
"description": "Label for the new feature button in the options page"
}
```
## Supported Languages (16)
| Code | Language |
|------|----------|
| `en` | English (source) |
| `de` | German |
| `es` | Spanish |
| `fr` | French |
| `it` | Italian |
| `pl` | Polish |
| `ru` | Russian |
| `pt-br` | Brazilian Portuguese |
| `sv` | Swedish |
| `el` | Greek |
| `cs` | Czech |
| `hr` | Croatian |
| `ja` | Japanese |
| `nb_NO` | Norwegian Bokmål |
| `zh_Hans` | Chinese Simplified |
| `zh_Hant` | Chinese Traditional |