Language in bibliography?

[Curtis Osterhoudt]

Hi, all,
 In my bibliography, I notice that many of the citations contain Polish, 
whereas I'd prefer everything in English :)  For example, a couple of books 
in the third edition have "wydanie 3rd", a doctoral dissertation contains 
"Praca doktorska", and  an article published in 1999 has "Czerwiec 1999". I 
can't find anywhere in my LyX document (preamble, in the text itself, etc.) 
nor in the bibliography entries (either native BibTeX editing or the various 
frontends like Pybliographic or KBibTeX) where Polish is used. Does anyone 
have any hints for me?

    Best wishes,
       Curtis O.