private MoData GetData(string baseName)
        {
            if (!_moDatum.TryGetValue(baseName, out MoData database))
            {
                var path = Path.Combine(TextFolder, baseName + ".mo");
                if (!File.Exists(path))
                {
                    return(null);
                }

                database = MoData.ReadFrom(path);

                _moDatum.Add(baseName, database);
            }
            return(database);
        }