clarkwinkelmann chawki Flarum is a javascript single page app powered by Mithril. The content is described via Mithril components and must be extended via javascript. You'll find an introduction here https://flarum.org/docs/extend/frontend.html
chawki by installing https://discuss.flarum.org/d/7026-linguist-customize-translations-with-ease this extension easy I can able to customize HTML tags