Change sub-forum icon

[beerForo]

I can change the forum fontawesome icon but the sub-forum icon does not change. What code would it be to also change subs?

This is for a link forum and the chain icon still shows in the sub-forum link on forum home, but in the forum itself (where the sub-forum exists at the top) it it changed. Also if an array is possible it's for multiple forums. Thanks!
Change sub-forum icon

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