I had to do the same thing for my version of bugzilla. In addition to
changing the database, you also need to change the knob templates to
correctly change/display states. In addition, there is a number of cgi
files and perl scripts that will need some changing. The best thing is
to take a program that searchs within files (I use PSPad which is free),
and search for former status and resolutions like NEW or RESOLVED. Look
at each place where they occur and change it to whatever you want.