So depends what you choose in J2 dropdown list in K2 have to have other choices, right?
Put into sheet code (not a standard module):
Private Sub Worksheet_Change(ByVal Target As Range)
Dim language As Variant
If Not Intersect(Target, [J2]) Is Nothing Then
Select Case Target
Case "Team 1"
language = [{"KA", "KT"}] ' assign value
Case "Team 2"
language = [{"GU"}] ' assign value
Case "Team 3"
language = [{"KA"}] ' assign value
End Select
With Range("K2").Validation
.Delete
.Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:=xlBetween, Formula1:=Join(language, ",")
End With
End If
End Sub
not tested.