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It will depend on your operating system. Windows users have reported the need to remove and reinstall the application for the langauge to switch.
Macintosh users have mostly reported the same behavior with the language changing without the need to reinstall.
This link may be helpful: http://helpx.adobe.com/creative-cloud/kb/change-installed-language.htm l.
You need to adjust the language setting in the Creative Cloud application. Please see Adjust the install language | Creative Cloud applications in the link
above.Please let us know if you require further assistance.
You can contact Adobe Support via http://adobe.ly/yxj0t6.