CAS genesisWorld is available in multiple languages.
The CAS genesisWorld log on window always contains a drop-down list from which you can select your desired language.
You can select the language you want to use from the drop-down list in Region and Language settings of the Windows Control Panel.
You can also enter language parameters l when starting CAS genesisWorld.
German: l=de
English: l=en
French: l=fr
Italy: l=it
Dutch: l=nl
Spanish: l=es
Turkish: l=tr
You have to install the language packages from CAS genesisWorld.
You can read more about program start parameters here: