Decimal separator changes comma to dot when focused to update cell. see in attached images.
Notes:
GridEditMode.InCell
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columns.Bound(p => p.ALIS_FIYATI).Width(220).Format("{0:n2}");
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<script src="@Url.Content("~/Scripts/kendo/cultures/kendo.culture.tr-TR.min.js")"></script>
<script>
kendo.culture("tr-TR");
</script>