Cake baked in a family child day to day.

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2 dl warm milk
3 tablespoons sugar
1 teaspoon salt
50 g butter, softened
2 egg yolks
100 g of yogurt
600 g flour
20 g yeast
+ 1 egg for lubrication

Two questions: 

1 - What is that filling?

2 - What is you main language? Maybe I can have your notes transalated.

Thank you