We don’t know why, but you have outdated PO file. Maybe because you are running not the latest version of the WoodMart theme. Try to add the following PHP code snippet to the child theme functions.php file to do this
add_action( 'woocommerce_before_shop_loop', 'woodmart_show_sidebar_btn', 25 );
function woodmart_show_sidebar_btn() {
if ( wc_get_loop_prop( 'is_shortcode' ) || ! wc_get_loop_prop( 'is_paginated' ) || ! woocommerce_products_will_display() ) return;
?>
<div class="woodmart-show-sidebar-btn">
<span class="woodmart-side-bar-icon"></span>
<span><?php esc_html_e('Click to filter', 'woodmart'); ?></span>
</div>
<?php
}