Change styles dropdown menu default name

Hello,

With the following function it is possible to add custom styles to the TinyMce editor:

function my_mce_before_init($init_array)
{
	// add classes using a ; separated values
	$init_array['theme_advanced_styles'] = "Highlight=highlight";
	return $init_array;
}
add_filter('tiny_mce_before_init', 'my_mce_before_init');

However I need an additional class to remove any applied styles with the class from dropdown menu. You can already do that by clicking back on the first dropdown option called “Styles”, which does not even look like an option.

Is it possible to rename the string “Styles” to “Normal” somehow?