add item to the dropdown menu

Template/board/column_dropdown.php

@@ -1,6 +1,9 @@
 <?php if ($column['nb_tasks'] > 0 && $this->user->hasProjectAccess('TaskModificationController', 'update', $column['project_id'])): ?>
-    <li>
-        <?= $this->modal->medium('arrows-h', t('Move all tasks to another column'), 'BulkMoveController', 'show', array(
+    <?php /* Rendered here (outside the menu <ul>) by the only available hook, then moved
+             into the column's real dropdown <ul> by Asset/js/relocate.js so it sits next
+             to the native entries. Hidden until relocated to avoid a flash in the header. */ ?>
+    <li class="bulkmovetasks-menu-item" style="display: none;">
+        <?= $this->modal->medium('arrows-h', t('Move tasks in bulk'), 'BulkMoveController', 'show', array(
             'plugin' => 'BulkMoveTasks',
             'project_id' => $column['project_id'],
             'column_id' => $column['id'],