Support Additional Languages Beyond Spanish & Chinese

Currently, localization is limited to English, Spanish, and Chinese via Localize‑Swift. Expanding to include other languages (e.g., French, German) would make the app more accessible to international visitors.
Sample:
```swift
// Example: adding French localization
Localize.update(provider: .mainBundle)
let _ = "welcome_message".localized(bundle: .main, tableName: "fr")
```

Start by reviewing the app’s existing Localize-Swift setup and its English, Spanish, and Chinese localization resources. Confirm which additional languages are in scope, since French and German are only examples, and verify that the shown localized lookup resolves their strings. No file or test entry point is named, so locate those before implementation.

Written by the indexing model from the issue text.