Are you getting an error, having a problem inputing Russian text, or not seeing the text in game? You will have to modify the font used in "Common.ui" to be able to see unicode characters in game.
For example, using the Microsoft JhengHei font:
Code:
include "Metadata/UI/CommonImages.ui"
include "Metadata/UI/PanelImages.ui"
include "Metadata/UI/Panel.ui"
<DEFINITIONS>
const $defaultScrollIncrement = 10;
// Font names
const $fontName = "Fontin";
const $fontNameSmallcaps = "微軟正黑體 Bold";
const $buttonFontName = "OptimusPrincepsSemiBold";
...