fixing bug #3960
fixing the way the user language is retrieved
Merge pull request #285 from NicolasEYSSERIC/bug-3960

fixing bug #3960
Update war-core/src/main/webapp/sharing/jsp/ticketManager.jsp

The fmt locale wasn't defined
fixing bug #3647
Preventing NullPointerException when first level value is removed
Merge branch 'core-5.11.x' into bug-3647
integration :  Merge branch 'bug-3647' of https://github.com/NicolasEYSSERIC/Silverpeas-Core into integration
fixing bug #3647