void ShowImportGUI()
        {
            if (GUILayout.Button("Import"))
            {
                if (availableFileFormats[chosenFileFormat] == csvFileEnding)
                {
                    string file = EditorUtility.OpenFilePanel("Select CSV file.", "", "");
                    if (file != null && file != "")
                    {
                        var values = CSVParser.Read(file, CSVParser.GetDelimiter(delimiter));
                        if (values.Count > 0)
                        {
                            LanguageHandlerEditor.BulkUpdateLanguageFiles(values);
                        }
                    }
                    this.Close();
                }
                else if (availableFileFormats[chosenFileFormat] == xlsFileEnding)
                {
                    string file = EditorUtility.OpenFilePanel("Select XLS file.", "", "");
                    if (file != null && file != "")
                    {
                        var values = XLSExporter.Read(file);
                        if (values.Count > 0)
                        {
                            LanguageHandlerEditor.BulkUpdateLanguageFiles(values);
                        }
                    }
                    this.Close();
                }
                else
                {
                    Debug.LogError("BulkUpdateWindow: Unsupported import format!");
                }

                if (parentWindow.translateLanguageWindow != null)
                {
                    parentWindow.translateLanguageWindow.ReloadLanguage();
                }
            }
        }