fix: disallow non-strings in GET parameters (#2908)

templates/base.html.php

@@ -4,7 +4,7 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="description" content="RSS-Bridge" />
-    <title><?= e($title ?? 'RSS-Bridge') ?></title>
+    <title><?= e($_title ?? 'RSS-Bridge') ?></title>
     <link href="static/style.css" rel="stylesheet">
     <link rel="icon" type="image/png" href="static/favicon.png">
 </head>

templates/error.html.php

@@ -1,6 +1,9 @@
 <div style="width: 60%; margin: 30px auto">
 
-    <h1>Something went wrong</h1>
+    <h1>
+        <?= e($title ?? 'Something went wrong') ?>
+    </h1>
+
     <br>
     <?= e($message) ?>
     <br>