Data Analysis Add-in appearing in a different language.

Using Office 2013 on  Windows 8. Original installation was in English. I installed the Japanese Language Pack for occasional use (need to practice). Office language and Windows language is set to English, but the Data Analysis tool is stuck in Japanese. As I have never used the Data Analysis tool, I am struggling with all the new words. Repair installing the English language pack, or repair installing Office itself, does not change the language back to English. Copying the files from C:\Program Files\Microsoft Office\Office15\Library\Analysis in a purely English installation over to the corresponding folder in my installation does not change the language. A few others who have had similar problems with earlier installations suggest doing something with config.xml but I don't know where that is. Any help would be greatly appreciated. Need to get some work done ASAP.