I'm using russian localization of the TWR2 and have found it buggy alot.
1. Soldiers voices in -battle and agents voices on champaign map are still English, diplomatic speeches too, but advisor voice is localized.
I'm playing the series from 2009 (Medieval 2) and voices always were localized except Shogun 2, but in Shogun 2 it was Japanese for all (English is not Latin after all! :-))
So is it bug or not?
2. Some text is not localized (for ex. legion history tab shows "Details" line in English)
3. Some text lines translated not correctly (for ex. land/navy units switch button in-battle shows "army" instead "navy" line in Russian for both)