Your friend is referring to Lisa sharing something on Instagram about her cat giving birth to a litter of kittens. The German words here roughly translate to: "Have you heard what Lisa shared on Instagram? Her cat had 3 little boys - they look so sweet. I want a cat too :(" So, your friend's cat had 3 new baby kittens, which means you can congratulate her on her little family of 3 new additions. You can say something like, "Wow, congratulations to your friend, Lisa! Her three new kitten boys look absolutely adorable. Their sweet little faces are sure to make anyone's heart melt. What a wonderful addition to her feline family."