I have found a revision with a seeming most complete content (that of 18:11, 10.02). How can I turn it into my actual version? When I click "work on it", the editor opens with another content.
it would also be nice to know how can I save my work on this article online. Actually, if I make some changes to the version I can edit(that of 28.01), and press "save draft", I still can edit only the version of (28.01). Is this article cursed? With the html file you've sent to me, I can delete this article and start the new one. Should I?
All the drafts are being saved. If you go back to a draft you can do a few things, if for some reason you can't edit it. There is a Rollback button so you can rollback to whatever draft you want, provided you check the box for the draft version. And you should also see icons in the upper right of each article. One should be "get the article's HTML for editing offline." If you click that you should get that draft's HTML. That's how I sent you the HTML for that specific draft.
Then keep a local copy for yourself, just in case (that's always just a good practice) as you go along.