Add a "return home" link to 404 errors

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/error/default.blade.php

@@ -0,0 +1,22 @@
+@extends('flarum.forum::layouts.basic')
+
+@section('content')
+  <p>
+    {{-- TODO: Change below to @php when Laravel is upgraded --}}
+    <?php
+      $getTranslationIfExists = function ($code) use ($translator, $settings) {
+          $key = 'core.views.error.'.$code.'_message';
+          $translation = $translator->trans($key, ['{forum}' => $settings->get('forum_title')]);
+
+          return $translation === $key ? false : $translation;
+      };
+
+      if (! $translation = $getTranslationIfExists($error->getCode())) {
+          if (! $translation = $getTranslationIfExists(500)) {
+              $translation = 'An error occurred while trying to load this page.';
+          }
+      }
+    ?>
+    {{ $translation }}
+  </p>
+@endsection