Refactoring/rewrite of modal boxes handling

app/Template/group/associate.php

@@ -4,7 +4,7 @@
 <?php if (empty($users)): ?>
     <p class="alert"><?= t('There is no user available.') ?></p>
 <?php else: ?>
-    <form class="popover-form" method="post" action="<?= $this->url->href('GroupListController', 'addUser', array('group_id' => $group['id'])) ?>" autocomplete="off">
+    <form method="post" action="<?= $this->url->href('GroupListController', 'addUser', array('group_id' => $group['id'])) ?>" autocomplete="off">
         <?= $this->form->csrf() ?>
         <?= $this->form->hidden('group_id', $values) ?>
 
@@ -15,10 +15,6 @@
             'defaultValue' => isset($values['user_id']) ? $values['user_id'] : null,
         )) ?>
 
-        <div class="form-actions">
-            <button type="submit" class="btn btn-blue"><?= t('Save') ?></button>
-            <?= t('or') ?>
-            <?= $this->url->link(t('cancel'), 'GroupListController', 'index', array(), false, 'close-popover') ?>
-        </div>
+        <?= $this->modal->submitButtons() ?>
     </form>
 <?php endif ?>