I'd say Vistalizator would be your best option on this case, since it allows you to change the display language after installation. My personal experience with this program has been already two succesfully changed languages without experiencing any kind of problems within the installation of the new language with this program. If you do not know how to use it, a tutorial can be found here:
http://www.froggie.sk/screens.html
I am sure this will solve your problem quite easily without hassle!
Cheers,
J4mmy
http://www.froggie.sk/screens.html
I am sure this will solve your problem quite easily without hassle!
Cheers,
J4mmy