Is the Russian version uses the low-res font? If yes you can do something about it with Deling.
- Open main.fs with Deling and extract sysfnt.tdw (it should be the font texture used by your version, hopefully).
- Go to Configuration > Text Encoding > Manage
- Add a new font and name it whenever you want. Click on Import... and select the extracted sysfnt.tdw file
Now you have a new font, you can select each character of the font and fill the text box on the right (below the character preview)
For your second question, sorry Deling edits field levels only (for now).
Use Doomtrain for this (I think):
http://forums.qhimm.com/index.php?topic=17090.0