Use bundled Roboto font

app.php

@@ -24,6 +24,7 @@ if (isset($_GET['page']) && !is_empty($_GET['page'])) {
     }
 }
 
+header("Link: <static/fonts/Roboto.css>; rel=preload; as=style", false);
 header("Link: <static/css/bootstrap.min.css>; rel=preload; as=style", false);
 header("Link: <static/css/material-color/material-color.min.css>; rel=preload; as=style", false);
 header("Link: <static/css/app.css>; rel=preload; as=style", false);

index.php

@@ -77,6 +77,7 @@ if (checkLoginServer()) {
 } else {
     $alert = lang("login server unavailable", false);
 }
+header("Link: <static/fonts/Roboto.css>; rel=preload; as=style", false);
 header("Link: <static/css/bootstrap.min.css>; rel=preload; as=style", false);
 header("Link: <static/css/material-color/material-color.min.css>; rel=preload; as=style", false);
 header("Link: <static/css/index.css>; rel=preload; as=style", false);