Resolve "Change material icon set"

Closes #258 (closed)

aleksis/core/static/js/main.js

@@ -192,6 +192,6 @@ $(document).ready(function () {
 const channel = new BroadcastChannel("cache-or-not");
 channel.addEventListener("message", event => {
     if ((event.data) && !($("#cache-alert").length)) {
-        $("main").prepend('<div id="cache-alert" class="alert warning"><p><i class="material-icons left">warning</i>' + gettext("This page may contain outdated information since there is no internet connection.") + '</p> </div>')
+        $("main").prepend('<div id="cache-alert" class="alert warning"><p><i class="material-icons iconify left" data-icon="mdi:alert-outline"></i>' + gettext("This page may contain outdated information since there is no internet connection.") + '</p> </div>')
     }
 });