Based on the message your friend shared, Lisa's cat (referred to as "Tatze," which is German for "paw") has given birth to three kittens. So, when congratulating your friend, you should acknowledge the arrival of these three new babies. Here's a possible way to phrase your congratulations in German, which seems to be the language your friend is using: "Herzlichen Glückwunsch zu den süßen kleinen Kätzchen! Es ist wunderbar, dass Lisas Katze drei gesunde Junge bekommen hat. Ich bin sicher, sie werden eine Menge Freude in euer Leben bringen – und vielleicht ja bald auch eine kleine Katze für dich? 😊🐱" Translated to English, this message reads: "Congratulations on the adorable little kittens! It's wonderful that Lisa's cat has given birth to three healthy kittens. I'm sure they will bring a lot of joy into your life – and maybe soon a little cat for you too? 😊🐱"