When I use wget (version 1.15) to get the content of "Projet:Jeu vidéo/Articles récents" on frwiki with the following API query:

wget -O response.json 'https://fr.wikipedia.org/w/api.php?format=json&action=query&prop=revisions&rvprop=content|timestamp&titles=Projet%3AJeu%20vid%C3%A9o%2FArticles%20r%C3%A9cents&continue=&maxlag=5'

the last byte of the response is a single quotation mark ' instead of a closing brace }.
The 20 last bytes of response.json are:
]</noinclude>"}]}}}'
expected:
]</noinclude>"}]}}}}

I get this only with my bot (that uses libcurl) and wget, not Firefox. This started happening today (April 19) between 11:02 UTC and 11:07 UTC.