Excluding CultureInfo from the type of nested object.

gistfile1.cs

// NestedFieldNameConvention
// we want to nest only lists of objects not previously mapped to a specific type by EPiServer Find
if ((type.GetGenericTypeDefinition() == typeof(IEnumerable<>))
    && !(type.GetGenericArguments()[0].IsValueType || type.GetGenericArguments()[0] == typeof(string) || type.GetGenericArguments()[0] == typeof(DateTime) || type.GetGenericArguments()[0] == typeof(CultureInfo))
    && !fieldName.Contains("$$")
    && !fieldName.StartsWith("__"))
{
    fieldName += "$$nested";
}

// IncludeTypeNameInNestedFieldNamesInterceptor
// we want to nest only lists of objects not previously mapped to a specific type by EPiServer Find
if ((type.GetGenericTypeDefinition() == typeof(IEnumerable<>))
    && !(type.GetGenericArguments()[0].IsValueType || type.GetGenericArguments()[0] == typeof(string) || type.GetGenericArguments()[0] == typeof(DateTime) || type.GetGenericArguments()[0] == typeof(CultureInfo))
    && !property.PropertyName.Contains("$$") 
    && !property.PropertyName.StartsWith("__"))
{
    property.PropertyName = property.PropertyName + "$$nested";
}