When exporting diagram into .eps file, DIA uses current LC_NUMERIC for
generating nombers in PostScript. So, using RU locale produces floating numbers
as this:
1,000 (i. e. comma instead of petiod). PostScript fails on this!
Steps to Reproduce:
1. Create any diagram (e. g. picture.dia)
2. dia picture.dia -e picture.eps
3. gs -q -dBATCH -dNOPAUSE -sDEVICE=bbox picture.eps
Actual Results:  
Error: /undefined in 28,346000
. . .
ESP Ghostscript 7.07.1: Unrecoverable error, exit code 1

$ grep 28.346000 picture.eps    
28,346000 -28,346000 scale


Expected Results:  
2. LC_ALL=C dia picture.dia -e picture.eps
3. gs -q -dBATCH -dNOPAUSE -sDEVICE=bbox picture.eps
%%BoundingBox: 0 0 431 431

$ grep 28.346000 picture.eps 
28.346000 -28.346000 scale