If you change from English (United States) to français, while at the data entry screen, the month and year isn't displayed correctly. It also causes data loss of any data that was previously in the form. If you are already in french when you go to the data entry screen, it's displayed correctly.
See the attached screen shots.
This happens with OpenMRS Version: 1.8.2 Build 21762, and Facility Data Module 2.0.2