Add dropdown menu on each board column title to close all tasks

app/Template/board/popover_close_all_tasks_column.php

@@ -0,0 +1,18 @@
+<section id="main">
+    <div class="page-header">
+        <h2><?= t('Do you really want to close all tasks of this column?') ?></h2>
+    </div>
+    <form method="post" action="<?= $this->url->href('BoardPopover', 'closeColumnTasks', array('project_id' => $project['id'])) ?>">
+        <?= $this->form->csrf() ?>
+        <?= $this->form->hidden('column_id', $values) ?>
+        <?= $this->form->hidden('swimlane_id', $values) ?>
+
+        <p class="alert"><?= t('%d task(s) in the column "%s" and the swimlane "%s" will be closed.', $nb_tasks, $column, $swimlane) ?></p>
+
+        <div class="form-actions">
+            <input type="submit" value="<?= t('Save') ?>" class="btn btn-red">
+            <?= t('or') ?>
+            <?= $this->url->link(t('cancel'), 'board', 'show', array('project_id' => $project['id']), false, 'close-popover') ?>
+        </div>
+    </form>
+</section>