I am using InstallShield 2008 Premier Edition and I have created a multilanguage setup. When I install the setup in language other than English (e.g. in French) it clearly shows all labels and messages correctly.
The problem starts when I run the generated setup.exe file again. It should show the Modify/Repair page in the language that was selected during install (i.e. in French) but it is always showing in Default Operating Language (English in our case).
However if I click the uninstallation icon on the Start-up menu it is showing in the language which I have installed (i.e. French).
Our requirement is that in both cases it should be same language (i.e. french) but this is not the case.
I haven't tried, but maybe you could change the uninstall command to include the parameter to set the language (see http://helpnet.acresso.com/robo/projects/installshield11helplib/IHelpSetup_EXECmdLine.htm , look for /L) and add that to the uninstall command that installshield sets up under "Software\Microsoft\Windows\CurrentVersion\Uninstall\" + PRODUCT_GUID . It does feel a bit hackisch, I'd really expect Installshield to do this automatically.