Improve add feed form

templates/add.php

@@ -8,8 +8,8 @@
 </div>
 
 <form method="post" action="?action=add" autocomplete="off">
-    <label for="url"><?= t('Website or Feed URL') ?></label>
-    <input type="text" name="url" id="url" placeholder="<?= t('http://website/') ?>" autofocus required/>
+    <?= Helper\form_label(t('Website or Feed URL'), 'url') ?>
+    <?= Helper\form_text('url', $values, array(), array('required', 'autofocus', 'placeholder="'.t('http://website/').'"')) ?>
     <div class="form-actions">
         <button type="submit" class="btn btn-blue"><?= t('Add') ?></button>
     </div>