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private void MainDataGridCellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
            if (e.Column == MainDataGrid.Columns[1])
                return;

            if (CheckComplianceWithIndentation)
                if ((NumberOfLeadingSpaces(Rows[e.Row.GetIndex()].OriginalText) != NumberOfLeadingSpaces(Rows[e.Row.GetIndex()].Translation)) && !Rows[e.Row.GetIndex()].Tags.Contains("I"))
                    Rows[e.Row.GetIndex()].Tags += "I";
                else if (NumberOfLeadingSpaces(Rows[e.Row.GetIndex()].OriginalText) == NumberOfLeadingSpaces(Rows[e.Row.GetIndex()].Translation))
                    Rows[e.Row.GetIndex()].Tags = Rows[e.Row.GetIndex()].Tags.Replace("I", "");

            if ((Rows[e.Row.GetIndex()].Translation.Trim() == "") && !Rows[e.Row.GetIndex()].Tags.Contains("N"))
                Rows[e.Row.GetIndex()].Tags += "N";
            else if (Rows[e.Row.GetIndex()].Translation.Trim() != "")
                Rows[e.Row.GetIndex()].Tags = Rows[e.Row.GetIndex()].Tags.Replace("N", "");

            //...
}

public void TagsInit()
{
            if (CheckComplianceWithIndentation)
                foreach (var hRow in Rows.Where(hRow => NumberOfLeadingSpaces(hRow.OriginalText) != NumberOfLeadingSpaces(hRow.Translation)))
                {
                    hRow.Tags += "I";
                }

            foreach (var row in Rows.Where(hRow => hRow.Translation == ""))
            {
                row.Tags += "N";
            }
}