Everything broken after 1.3 upgrade

I updated OTA easily (french firmware), but, after rebooting, I have a very strange user interface :
-no more icons, neither widgets
-black theme everywher, with white letters
-not better after installling a new theme : black parts become grey
-pink strip on top of the screen
-crash of some apps (calendar, params)

I must click on the places where I suppose icons are to make actions.

Not very convenient.

an idea on how to fix ?