Add fieldset to config form

Author: fguillot

Template/config/application.php

@@ -1,3 +1,6 @@
-<?= $this->form->label(t('Email domain restriction for sign up'), 'registration_email_domain') ?>
-<?= $this->form->text('registration_email_domain', $values, $errors, array('placeholder="domain1.tld, domain2.tld, domain3.tld"')) ?>
-<p class="form-help"><?= t('Only people with this email address will be allowed to sign up.') ?></p>
+<fieldset>
+    <legend><?= t('Registration') ?></legend>
+    <?= $this->form->label(t('Email domain restriction for sign up'), 'registration_email_domain') ?>
+    <?= $this->form->text('registration_email_domain', $values, $errors, array('placeholder="domain1.tld, domain2.tld, domain3.tld"')) ?>
+    <p class="form-help"><?= t('Only people with this email address will be allowed to sign up.') ?></p>
+</fieldset>