Interfaces: Prepare language attribute in ADUser

Interfaces/ActiveDirectoryInterface.vb

@@ -193,6 +193,8 @@ Public Class ActiveDirectoryInterface
                                                     .FirebirdSyskey = oMap.FirebirdSyskey,
                                                     .MSSQLColumn = oMap.MSSQLColumn
                                                 })
+                                            Else
+                                                _logger.Debug("Attribute [{0}] is empty.", oMap.AttributeName)
                                             End If
                                         Next
                                     Else

Interfaces/ActiveDirectoryInterface/ActiveDirectoryUser.vb

@@ -8,6 +8,7 @@ Public Class ADUser
     Public Property GivenName As String
     Public Property Middlename As String
     Public Property Email As String
+    Public Property Language As String
 
     Public CustomAttributes As List(Of CustomAttribute)