Hey Bent_Larsen
We are always adding new payloads and in different languages. AST has a theme of training end-users using relevant, real world phishing emails as this is the best way to reduce your organisations risk. Training your users using the same phish that they would see in a real-world phishing attack enables them to identify real/authentic phishing. Subsequently, we don't author the payloads ourselves but harvest actual payloads - majority of these are in English.
If your organisation however receives a lot of payloads in Polish and German, consider setting up a payload harvesting simulation in your tenant. This enables you to take those phishing emails (in Polish and German) and use those in your campaigns! It's really simple to do so. Instructions here: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/attack-simulation-training-payload-automations?view=o365-worldwide