fix (#3883)

app/views/user/details.phtml

@@ -7,7 +7,7 @@
 <div class="post">
 	<a href="<?= _url('user', 'manage'); ?>"><?= _t('admin.user.back_to_manage'); ?></a>
 
-	<legend><?= $this->username ?><?php if ($isAdmin) echo ' ― ', _t('admin.user.admin'); ?></legend>
+	<h1><?= $this->username ?><?php if ($isAdmin) echo ' ― ', _t('admin.user.admin'); ?></h1>
 	<form method="post" action="<?= _url('user', 'manage', 'username', $this->username); ?>">
 		<input type="hidden" name="_csrf" value="<?= FreshRSS_Auth::csrfToken(); ?>" />