Glad to help, and thank you as well!
Another thing I noticed is that there are some references to font awesome icons in the rules that likely don't take effect anymore after switching to remixicons? One of them is this one, related to the "save search" text in mobile, as far as I understand?:
gitlab.com/randompenguin/bookf…
...I wonder if that one is still needed, and if it's not, maybe those two translation strings can be removed as well, so the only one left is "--community-post-text", which Frio might not have. Or at least I haven't added it myself. But it's a good warning.