For anyone insterested in this installation, note that at this point in time the guidelines provided above will not install internationalization files automatically. That is: GTK stock button labels will be displayed in English whatever your computer setting are. If you want perl/gtk2+ to consider automatically your computer settings, you will have to copy the files present in your gtk install at \gtk+\share\locale to strawberry_perl\perl\site\share.

Since I had to apply this little additional procedure to have my install worked as desider, I think it can be usefull to others interested by this thread too.

Cheers