keyboard language settings not respected in logging screen

[MB]

1) connect an external AZERTY bluetooh keyboard to the Aquaris M10 phablet
2) change keyboard layout in system settings ( French keyboard ,azerty)
3) open the native web browser, type in an url : the new keyboard settings are functioning
4) lock the session
5) enter the password to unlock : the keyboard layout chosen in system settings is not respected, the (default) qwerty layout is active for the password field on the logging screen. ( the keyboard settings chosen in step 2 should be active)
6) enter the password pretending the keyboard is a qwerty one
7) the session is unlocked
8) repeat 3) : keyboard settings (french) are active

Tested on Aquaris M10, with the latest Ubuntu Touch OS (15.04) and the Logitech K480 keyboard