It looks like you're referring to a feature called "Invoice Manager 2119" and a multilingual activation link.
Never share your activation link publicly. Links are often one-time-use or tied to your hardware ID. If posted online, someone else could steal your license. invoice manager 2119 multilingual activatio link
When you switch languages, the invoice populates the correct description automatically. It looks like you're referring to a feature
: Best for unlimited invoices with basic customization, especially if you also handle in-person sales. invoice manager 2119 multilingual activatio link
The multilingual feature is typically locked and requires a license key or an activation URL.