Why is russian beta testing software on my Mac?
It looks like Feedback Assistant.app. Maybe it's missing the en translations. You can check if that really is the correct app in Terminal with: 

ls /System/Library/CoreServices/Applications


The output will reveal the real (not translated) applications names. 

The Ассистент обратной связи string could be found using:

plutil -p Feedback\ Assistant.app/Contents/Resources/ru.lproj/InfoPlist.strings 


The output:


  {
    "CFBundleDisplayName" =&gt; "Ассистент обратной связи"
    "CFBundleName" =&gt; "Ассистент обратной связи"
  }


To make sure, the app is really from Apple you can run

codesign -d -vvv Feedback\ Assistant.app


and look for Authority=Apple Code Signing Certification Authority.