[IMP] hr: renamed hr_department description to 'Department'

When creating a department, a default message appears in the chatter
that says "HR department created". It is misleading because the
department is not necessarily HR.

addons/hr/hr.py

@@ -272,7 +272,7 @@ class hr_employee(osv.osv):
 
 class hr_department(osv.osv):
     _name = "hr.department"
-    _description = "HR Department"
+    _description = "Department"
     _inherit = ['mail.thread', 'ir.needaction_mixin']
 
     def _dept_name_get_fnc(self, cr, uid, ids, prop, unknow_none, context=None):