ISSUE SUMMARY:
I'd like to add Russian language to Alphabetic filter like this one - "Все abc def ghi jkl mno pqr stu vwx yz абв где жзи клм ноп рст уфх цчш щэюя Другие"
How can I do it?

Hi,

could you please elaborate more? your request not clear for me.
I saw at your site Alphabetic filter = По алфавиту (translated)

please edit your first post at this topic, and provide me super user login detail. so I can provide you a valid code, I need to have a look at your site deep inside.

Regards