altering document class

[jim]

I need to make a minor change to the mwrep report class, so that 
the Bibliography is labelled `References' instead. I am using lyx 1.4.2 
on ubuntu linux. I know nothing of latex but screwed my courage to 
the sticking place and edited  /usr/local/share/lyx/layouts/mwrep.layout
 and /usr/share/texmf-tetex/tex/latex/mwcls/mwrep.cls simply changing 
instances of `Biibliography' to `References'. I ran Tools/Reconfigure 
and restarted lyx. The section is labelled `References` within 
the app but 
when I prepare an output file it is still called Bibliography. Can you 
tell me 
how to proceed or point me to some docs please?

Thanks!
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