Bug 1035383 - [B2G][Camera] The user is able to use the camera when batt...

...ery is below 5%
Perhaps something like this may be clearer:

```js
if (!this.app.localized()) {
  this.app.showLoading();
  this.app.once('localized', function() {
    this.createOverlay(type);
  });
  return;
}
```

So not creating any overlay until we know that the app is localized.