Hi Yana Ghahramanyan,
I have just checked again with IE 11 and it doesn't works sorry. Also with firefox 50.1.0 it does not work either.
I wasn't able to switch between the languages. Please can you try like me to switch from main site to french language.
Know that I try to use the mouse wheel to scroll the dropdown list and select the language same you told me.
Besides that I use the mouse wheel to scroll or the scroll buttons it's the same, and I want users to be able to use mouse wheel to scroll or the scroll buttons.
Please find screen shot of internet explorer 11:
Please find screen shot of FIREFOX 50.1.0:
Could you please help me to solve this problem.
Thanks in advance.