Source
File: wp-includes/customize/class-wp-customize-nav-menu-control.php
public function content_template() {
$add_items = __( 'Add Items' );
?>
<p class="new-menu-item-invitation">
<?php
printf(
/* translators: %s: "Add Items" button text. */
__( 'Time to add some links! Click “%s” to start putting pages, categories, and custom links in your menu. Add as many things as you’d like.' ),
$add_items
);
?>
</p>
<div class="customize-control-nav_menu-buttons">
<button type="button" class="button add-new-menu-item" aria-label="<?php esc_attr_e( 'Add or remove menu items' ); ?>" aria-expanded="false" aria-controls="available-menu-items">
<?php echo $add_items; ?>
</button>
<button type="button" class="button-link reorder-toggle" aria-label="<?php esc_attr_e( 'Reorder menu items' ); ?>" aria-describedby="reorder-items-desc-{{ data.menu_id }}">
<span class="reorder"><?php _e( 'Reorder' ); ?></span>
<span class="reorder-done"><?php _e( 'Done' ); ?></span>
</button>
</div>
<p class="screen-reader-text" id="reorder-items-desc-{{ data.menu_id }}"><?php _e( 'When in reorder mode, additional controls to reorder menu items will be available in the items list above.' ); ?></p>
<?php
}