Does this work?
"Just quit from Photoshop CC and go to your Applications/Adobe Photoshop CC/xx_XX/Locales/Support Files folder and find the "tw10428.dat" file. Change the name of this file from "tw10428.dat" to "tw10428.bak". Launch your Photoshop CC again. Now your Photoshop CC is in English.Jun 19, 2013"