When you do a multilingual installation, you can have your installation display a language selection dialog. However, it’s not so easy to find how to turn this on. I’ll show you where to look.
How to turn on the language selection dialog in InstallShield
Just go to the Releases view, right-click your release and select the Release Wizard. Then scroll through the wizard pages until you get to the Setup Languages page. Here you see a checkbox that says Display the Setup Languages Dialog. Just select it and the dialog will appear when you first run your installation.