Add a "return home" link to 404 errors

src/Http/Middleware/HandleErrors.php

@@ -85,7 +85,11 @@ class HandleErrors
         // Log the exception (with trace)
         $this->logger->debug($error);
 
-        $view = $this->view->make('flarum::error')->with('error', $error);
+        if (! $this->view->exists($name = 'flarum::error.'.$status)) {
+            $name = 'flarum::error.default';
+        }
+
+        $view = $this->view->make($name)->with('error', $error);
 
         return new HtmlResponse($view->render(), $status);
     }

views/error/404.blade.php

@@ -0,0 +1,12 @@
+@extends('flarum.forum::layouts.basic')
+
+@section('content')
+  <p>
+    {{ $translator->trans('core.views.error.404_message') }}
+  </p>
+  <p>
+    <a href="{{ $app->url() }}">
+      {{ $translator->trans('core.views.error.404_return_link', ['{forum}' => $settings->get('forum_title')]) }}
+    </a>
+  </p>
+@endsection

views/layouts/basic.blade.php

@@ -34,6 +34,7 @@
         cursor: pointer;
         color: {{ $primaryColor }};
         text-decoration: none;
+        font-weight: bold;
       }
       a:hover {
         text-decoration: underline;