I use Anki to learn Russian vocabulary. I have been trying to create my own card template with an URL that points towards Wiktionary. The problem is that my words are most often accentuated (because, why not...), and I see that in two links below, with and without accent, only one pings.
only the second one (unaccentuated) works. I see that the difference in the URL between both symbol chains (what are these %XX anyway ?) is %CC%81, which seems to corresponds to how Firefox understands the presence of this particular accent. Probably for ё it's something else.
I use Ilya Birman's typography keyboard for the accents on my mac, but the link is the same if I copy-paste Wiktionary's сле́дующий from this page, so that is not the problem.