I've just made similar stars for my site, but could find no way of adding them using the editor, so I copy/pasted them from the source of this page, reducing them to 5 and changing 'usefulness' to 'quality'. Now, with the summative grading option on forums, I can set students the task of achieving 15 stars in the debate forum instead of doing an essay. How cool!
I vote for adding a stars scale to moodle core.
Moodle community sites
Fonts changes on moodle.org
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