Backend language setting not honored on login

Hi,

I find this plugin very useful.

But, since upgrading to WP4.0, I have to switch to my preferred language (by clicking the language name in the main admin menu) every time I log in. The setting in Settings->Backend Language is still set to my preference, but it does not seem to be honored upon login.

https://www.ads-software.com/plugins/kau-boys-backend-localization/