Hello guys!
I've found two Russian translation mistakes. They are in tips at the status bar for Brush and Replace Color tools (see attached screenshot).
<data name="RecolorTool.HelpText" xml:space="preserve">
<value>Left click to draw with primary color, right click to draw with secondary color.</value>
</data>
<data name="PaintBrushTool.HelpText" xml:space="preserve">
<value>Left click to draw with primary color, right click to draw with secondary color.</value>
</data>
Correct string for both of them is
"Левая кнопка - рисовать основным цветом, правая кнопка - использовать дополнительный цвет."
Also there should be a dot at the end of the string for Linetool's tip like in all other strings.