I'm guessing you mean post content.
It would be extremely difficult, since filter:parse.post isn't passed the viewers UID. Which it should be, imo.
I'm wondering if this can be done with a plugin and how much a developer would charge to create. If this can be done, and you're interested in helping, please send me a bid. The plugin can remain free for everyone else to use once it's been developed.
It seems like a plugin is the best option so it isn't over-written when I upgrade NodeBB.
Here are the icons I was hoping to include on the NodeBB forum I have:
I'd pitch in to help on this too! I'd love to even have an option to add additional icons instead of just using the FontAwesome ones.
@teh_g No bids yet.
I think you can contact directly @julian to know how much they take to implement the functionality you want in NodeBB or in a plugin
I also was thinking I would like to replace font awesome. I particularly like the open source Material Design Icons.