1. Use the German version
2. Use the following in a script
     POL_SetupWindow_presentation "TITLE" "Game Developer" "URL" "ScriptAuther" "PREFIX"
will result in
     "Dieser Assistent wird Ihnen bei der Installation helfen TITLE auf Ihrem Computer."

It should say:
     "Dieser Assistent wird Ihnen helfen, TITLE auf Ihrem Computer zu installieren."

I assume that the problem is that two translation strings are joined with the TITLE inbetween:
     TranslationString522 + " " + TITLE + " " + TranslationString517

One solution would be to use one translation string for that line:
     "This wizard will help you install $APPLICATION_TITLE on your computer."