Next version of Unleashed will read text off UTF8-json which will make translation easier, following ERA-style.
I have put together the russification from this thread (thanks @Grossmaster) and from SoD_SP text (thanks @igrik); however there are still some missing fields.
Here is what I have so far, in case someone would like to fill in the blanks. As much text as possible is read from mapeditor assets (e.g. "OK", "Spell", "Reward") unlike previously.

Font has been corrected to correctly show full text width, at the very least for English and Russian, but I need to widen a few fields which are not taking into account longer strings at the moment.