On the A Clockwork Orange (novel) page, there's a link to wikt:jeu d'esprit. On macOS Safari, there is no issue following this link, but on the iOS Wikipedia app, it trips over the apostrophe while redirecting to the mobile link, landing at https://en.m.wiktionary.org/wiki/jeu%2520d'esprit. I suspect this is an issue with the template at large or the way Wiktionary is processing the encoding related to mobile redirects. I’m not super knowledgeable myself.