Improve user controllers and views

app/Template/user_view/external.php

@@ -0,0 +1,11 @@
+<div class="page-header">
+    <h2><?= t('External authentications') ?></h2>
+</div>
+
+<?php $html = $this->hook->render('template:user:external', array('user' => $user)) ?>
+
+<?php if (empty($html)): ?>
+    <p class="alert"><?= t('No external authentication enabled.') ?></p>
+<?php else: ?>
+    <?= $html ?>
+<?php endif ?>