tt-a1i commented on issue #35569:
URL: https://github.com/apache/superset/issues/35569#issuecomment-3707876800
Hey, ran into this exact issue while setting up Superset with Chinese as the
default language. Spent some time digging into the code and I think I found
what's going on.
## The Problem (Two Parts)
### 1. Backend: hardcoded fallback
In `superset/views/base.py`, there's this line:
```python
language = locale.language if locale else "en"
```
When `get_locale()` returns `None` (like for unauthenticated users on the
login page), it just falls back to `"en"` instead of using the
`BABEL_DEFAULT_LOCALE` config. So the frontend gets `locale: "en"` in bootstrap
data and never even tries to load the language pack.
### 2. Frontend: race condition
In `preamble.ts`, the language pack loads in an async IIFE:
```typescript
(async () => {
// load language pack...
})();
// nobody awaits this!
```
And `index.tsx` just does:
```typescript
import 'src/preamble';
ReactDOM.render(<App />, ...); // runs immediately
```
So React starts rendering before the language pack is ready. By the time it
loads, the components already rendered with English text.
## Fix I've Been Using
**Backend:**
```python
language = locale.language if locale else
app.config.get("BABEL_DEFAULT_LOCALE", "en")
```
**Frontend:** Export `initPreamble()` as a function returning
`Promise<void>`, then `await` it before rendering:
```typescript
// index.tsx
(async () => {
try {
await initPreamble();
} finally {
const { default: App } = await import('./App');
ReactDOM.render(<App />, appMountPoint);
}
})();
```
This has been working well in my deployment. Happy to put together a PR if
this approach makes sense to you all.
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