It happened to me on v1.11.1 too. You can "fix" it by setting this to 0 on posts settings.
When I change language in admin settings and restart server, application is still in old language ...
On master with last commit :
2e49fe9 2014-05-18 | fixed meta property to name, for keywords (HEAD, origin/master, origin/HEAD, master) [Julian Lam]
It works for me on latest. Maybe try to clear your cache.
@dove it is working.