Elimitate default texts

How can I eliminate this texts and reports:

(2 votes, average: 4,50 out of 5, rated) You need to be registered to rate this post

I tried by adding in my style.css

post-ratings em{
	display: none;
}

but the () are outside the em so they are still showing. I tried then overriding the plugin, deleting in the file postratings-templates.php the corresponding code to
(<em>...</em>
then I deactivated the original plugin and activated my override and still the texts are showing up.

Is there any option to hide these texts?

https://ww.wp.xz.cn/plugins/wp-postratings/