Thanks for the continuous support. That incompetence in our team, it came from my ignorance. I just dipped in to this "fonts" story.
Anyway, you are right. Our Moodle, release 3.5.x, has the icons in https://fontawesome.com/v4.7.0/cheatsheet/, or at least the dozen I checked. Created a live cheat sheet as evidence and passed on to the users. We will first look in to how urgent the new icons are. So the issue is paused.
FontAwesome: Some fonts missing. [Moodle 3.5.6+]
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