Reset current user on each test.

git-svn-id: http://svn.redmine.org/redmine/trunk@13771 e93f8b46-1217-0410-a6f0-8f06a7374b81
Set locale for error messages.

git-svn-id: http://svn.redmine.org/redmine/trunk@13772 e93f8b46-1217-0410-a6f0-8f06a7374b81