Here's how I translated the recipe:
1 to 1-1/2 cups flour
1/2 cup granulated sugar
1/4 teaspoon cinnamon
1 stick unsalted butter (not specified in the recipe, but I would add)
1/2 teaspoon vanilla extract
3-1/2 cups all-purpose flour
2 to 2-1/2 teaspoons baking powder (Tatjana probably used one of these)
1/2 teaspoon cinnamon
2 sticks margarine
1 stick butter
1 "cup" granulated sugar
1 teaspoon vanilla extract
1 cup milk
Marmalade or jam
Preheat the oven to 400 degrees F and adjust the rack to the center position.
For the Streusel: Mix together the flour, sugar, and cinnamon. Cut in the butter until the mixture is crumbly. Stir in the vanilla. Chill the streusel while you prepare the cake batter.
For the Cake: Sift together the flour, baking powder, and cinnamon. Set aside.
Cream the margarine, butter, and sugar. Add the eggs, one at a time, beating well after each addition. Add the vanilla.
Alternately fold in the sifted dry ingredients and the milk, beginning and ending with the sifted dry ingredients.
Spread the dough on a greased, flat baking pan (size not specified). Spread some marmalade or jam over the top.
Scatter the streusel over the top of the cake. Bake for about 40 minutes. If the cake is not ready after 40 minutes, then lower the oven temperature to 350 degrees F and bake for another 10 minutes.