There is a bug in the Web visual editor of Wikipedia. What you see is not what you get.
I go to fr.wikipedia.org/wiki/autocontrôle_boursier
I click modifier
I get the Web visual editor.
I edit the article...
I change the link "Bourse" into "bourse", with a small "b".
The link appears correctly: "bourse" with a small "b".
I save my edit...
My edit is saved.
In the saved article, the link is now "bourse" with a small "b".
In the saved article, the link is still "Bourse" with a big "B". The visual editor has forgotten my case change.
I do not know exactly what happened. I cannot reproduce the bug now. But I have a screen photo of the visual editor, before saving, correctly showing the changed case.
You can see my edit in the history of the article. It is the first edit by me on this article.
I have Safari on iOS 8.2 on an iPad in landscape with the reading list open on the left.
It would be nice to isolate and fix this bug.