BDORAPP-994: Handle birth date in User

MANDATORY

• Fill in the JIRA ticket using the following template :

h2. Dépendance(s) externe(s)
h2. Description
h2. Solution technique (présentée en commission technique)
h2. Plan de test (pour le test manager)

• Merge or rebase the current branch with sprint (example : git rebase -i 3.11/sprint)
• Test the merged version (all unit tests / manual tests only for the issue)
• If needed, add or update Confluence documentation (except for bug fixes)
• If needed, update the next release page : https://moviplus.atlassian.net/wiki/spaces/SYN/pages/287342640/Prochaine+version