1. go to https://fr.wikipedia.org/wiki/Cat%C3%A9gorie:Portail:Juda%C3%AFsme (Catégorie:Portail:Judaïsme)
2. click on "Related changes" on the left sidebar

Expectation:

• the field where the page watched displays the title well encoded
• category name is well encoded in the URL and the URL works

Reality

• Cat%C3%A9gorie:Portail:Juda%C3%AFsme is displayed
• URL seems to use that field's content and is broken (Cat%25C3%25A9gorie%3APortail%3AJuda%25C3%25AFsme)
  • Note: it is broken only if the targeted page has diacritics. Catégorie:Portail:Rennes works even if displayed as Cat%25C3%25A9gorie%3APortail%3ARennes.