I have installed Visual Studio 2017 RC, and by default it set language to my system language (Polish) so I was trying to change it to EN but in Options > Environment > Inter
I didn't find a complete answer here
Firstly
You should install your preferred language
Secondly
Go to Tools -> Options
2.Select International Settings in Environment
3.click on Menu and select you preferred language
4.Click on Ok
5.restart visual studio