1. Open the Wikipédia App, here the French;
2. Go to random french Wikipédia article;
3. Scroll down;
4. Tap on "View page in browser";
5. You'll be redirected to a page that "can't be reached", because the form of the URL is: http://fr.m.m.wikipedia.org/

One "m" must be deleted. It seems that this problem is only present on the French articles.