I do this bug report in wordpress support system about and kathrynwp write me:
Hi there – I see that your site’s interface language is currently set to English:
I think that someting is not fine becouse from my panel the site is in french, the site and my personal settings:
Personal settings in french lang.
Site conf in french lang.
Yes, is a bug, wordpress people say me:
Just an update to let you know that your suggested language behaviour should be implemented in a future software update.