Viachaslau it is off coarse up to you which term you use in your translation but keep in mind that a trowel is used primarily in stone masonry (Кельма). and although you definitely get an enormous amount of kitchen utensil links for spatula if you look beyond those links you will see that it is also a tool in a laboratory or in construction. it comes in many shapes and is very common. below is a website selling tools for renovation. it has both spatulas and trowels. compare the differences!
http://www.paintandplasters.com/index.php?x=main/cat/PavanTo...
i say this only to help make your translation accurate
The translation workplace 
