clarify refund policy

Author: kevinpapst

_data/developer.yml

@@ -22,7 +22,7 @@ kevinpapst:
         - title: What happens if I cancel the subscription?
           content: "If you purchase a plugin subscription, you’ll receive all updates, bugfixes, and support for one year. After the subscription ends, your plugin will continue to work without any restrictions – you can keep using the last version you downloaded. This model is known as a **perpetual fallback license**. However, access to future updates, new features, and compatibility fixes require an active subscription."
         - title: Do you offer refunds?
-          content: "Since Kimai plugins are downloadable products, I am unable to offer refunds. Once you download the source code, it’s yours to keep, and I can’t retrieve it. The same applies for subscriptions that were not canceled in time."
+          content: "No, refunds are not available. Kimai plugins are delivered as digital downloads and cannot be returned once the source code has been accessed. Additionally, payment providers charge non-refundable transaction fees, even if a refund were issued. For these reasons, all sales are final. Please try the demo versions or contact us before purchase if you’re unsure whether a plugin fits your needs."
 
 valentina:
     username: ivalentina