Force language does not override Profile settings in Forum display settings

Force language parameter in Course Admin settings does not override user's personal Profile settings in Forum display settings.
Example:
User's Personal profile Preferred language = French
Course settings: Force language = English
When user views a forum in that course, all the elements in the interface are in English except the drop-down box of forum discussions display settings, which remain in the user's preferred language, i.e. French. See attached screen shot.

Joseph