On Chargebee you can choose your invoice's language by going to Edit Account Details and choosing from the available options.
Auto-Detect Browser Language
Chargebee automatically displays content in the browser's language if no specific language is set. You can enable or disable this for:
- Single Page Checkout: - Settings > Checkout & Portal > Field Configurations
- In-app Checkout: - Settings > Checkout & Self-Serve Portal > Use browser locale
Here's how:
- For Hosted Pages (V2) 
 Enable language selection in Chargebee by navigating to:
 โ- Settings > Configure Chargebee > Checkout & Self-Serve Portal > Field Configurations
 This adds a dropdown for customers to pick their language.

2. For Hosted Pages (V3)
Go to:
โSettings > Configure Chargebee > Advanced Settings
Enable "Allow Customer to Change Locale" for seamless language switching.

For more details, check the Chargebee support guide.