I guess you wll be able to solve this problem by updating to 18.104.22.1688. After the update I was able to show proper russian characters like "Безопасность" instead of "Áåçîïàñíîñòü" e.g. in the Edit Translation Unit Dialog. There are several enhancements regarding Unicode support in 22.214.171.1248.
Also 126.96.36.1998 seems to solve a significant problem (did not test this though):
When working with any non-Western language such as Greek, Turkish, Russian etc., Translator's Workbench no longer corrupts target language segments. This means it is now possible to use Greek as the language for non-Unicode programs in Windows 2000 or XP and still use Translator's Workbench for translating into/from Greek in Word.