Display correctly "Add" button label for the block class \Magento\Config\Block\System\Config\Form\Field\FieldArray\AbstractFieldArray

Author: sylvainraye

app/code/Magento/Config/Block/System/Config/Form/Field/FieldArray/AbstractFieldArray.php

@@ -279,4 +279,12 @@ public function getColumns()
     {
         return $this->_columns;
     }
+
+    /**
+     * @return string
+     */
+    public function getAddButtonLabel()
+    {
+        return $this->_addButtonLabel;
+    }
 }

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

@@ -28,7 +28,7 @@ $_colspan = $block->isAddAfter() ? 2 : 1;
             <tr>
                 <td colspan="<?php echo count($block->getColumns())+$_colspan; ?>" class="col-actions-add">
                     <button id="addToEndBtn<?php /* @escapeNotVerified */ echo $_htmlId; ?>" class="action-add" title="<?php /* @escapeNotVerified */ echo __('Add'); ?>" type="button">
-                        <span><?php /* @escapeNotVerified */ echo $block->getAddButtonLabel(); ?><?php /* @escapeNotVerified */ echo __('Add'); ?></span>
+                        <span><?php /* @escapeNotVerified */ echo $block->getAddButtonLabel(); ?></span>
                     </button>
                 </td>
             </tr>