ENGCOM-1564: [Backport] Translate action Label #15221

 - Merge Pull Request #15221 from rogyar/magento2:2.1-translate-action-label
 - Merged commits:
   1. 07dae79

Author: magento-engcom-team

app/code/Magento/Config/view/adminhtml/templates/system/config/form/field/array.phtml

@@ -21,7 +21,7 @@ $_colspan = $block->isAddAfter() ? 2 : 1;
                 <?php foreach ($block->getColumns() as $columnName => $column): ?>
                     <th><?php /* @escapeNotVerified */ echo $column['label']; ?></th>
                 <?php endforeach;?>
-                <th class="col-actions" colspan="<?php /* @escapeNotVerified */ echo $_colspan; ?>">Action</th>
+                <th class="col-actions" colspan="<?= /* @escapeNotVerified */ $_colspan ?>"><?php /* @escapeNotVerified */ echo __('Action') ?></th>
             </tr>
             </thead>
             <tfoot>