Some Russian companies still store their old data (in databases and/or files) in KOI8-R. I'm not sure how many of them may be using Django, but I personally worked for a company in 2014-2015, that maintained a huge database of articles stored in KOI8-R. I can assume that, similarly, KOI8-U may be used in Ukraine. This is just how it turned out to be historically. Windows encoding CP1251 is found less often, but even in mid-2000's it was still competing with KOI8, so there may be some old databases in this encoding somewhere, too. I would suggest keeping this setting for now.
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