summernote font size doesn't shows

I'm trying to use the summernote to display the text editor. I have used this code to display it:

$('#editor').summernote({
        toolbar: [
            ['style', ['style']],
            ['text', ['bold', 'italic', 'underline', 'color', 'clear']],
            ['para', ['ul', 'ol', 'paragraph']],
            ['height', ['height']],
            ['size', ['fontsize']],
            ['font', ['fontname']],
        ],
        fontsize: '18px',
        onblur: function() {
            var text = $('#editor').code();
            text = text.replace("<br>", " ");
            $('#description').val(text);
        },
        lang: language_value
    });

but only font-size doesn't display. Is there any other way to display it?