I repost my question as a feedback :)
I seen some sentances that could be better translated, two exemples you can see below;
Per the feedback received;
Also, please indicate how you got to the French translation. The site is only supported in English.
To repro the error;
I use a French OS (Windows 10)
I don't use any browser add-on that could translate the website.
I tried differents vanilla browser, Internet Explorer, Firefox, Chrome for the same result, the menu and the side bar text is in french
I tried via my iPhone (iOS 13.x) which is in french too, and the mobile view is in french too. I join a printscreen for that too;
At that point I really guess that it's a OS detection that trigger a french template and/or a french traduction from maybe a service like Microsoft Translator API if the Q&A/DOCS use such API.