private static void addSpecificTextField(string userField, string language)
{
if (language == null)
{
throw new ArgumentNullException(nameof(language));
}
UserFields.Add(userField);
LocalizedFields.Add(userField);
userField = userField.ToLowerInvariant();
var localized = GetLocalizedField(userField, language);
_textFields.Add(localized);
DisplayFieldByIndexField.Add(localized, userField);
}
