It's been years since I have to manually edit your addon every time it updates, and I think it's time to end this.

So issue is that string truncation happening at https://github.com/Auctionator/Auctionator/blob/master/AuctionatorUtil.lua#L58
Not only it breaks search for many items with long names in Russian locale, but also completely useless and can be removed.

Another issue is with search box being limited to 64 bytes for no reason
https://github.com/Auctionator/Auctionator/blob/master/UI/Templates/Frames/Sell.xml#L76
I had to double it's limit so items with long names can fit it.