Hello,
it's written in German language but I think it shouldn't be a problem to follow the images:
http://jasker.biz/2014/02/mehrere-sprache-parallel-nutzen-in-der-adobe-creative-cloud/
On the other hand might be this of interest: Creative Cloud Help/Adjust the install language|CCM >>> The language for the Creative Cloud applications is different from what you expect. >>> http://helpx.adobe.com/creative-cloud/kb/change-installed-language.html
If necessary and for further questions click through Kontakt kundestøtte and if "open" please use chat, I had the best experiences. I quote from Adobe's employee Preran: The chat button is activated as soon as there is an agent available to help.
Good luck!
Hans-Günter