How to insert translation string into php code?

Question

WordPress

How between span tag

<?php echo apply_filters( 'woocommerce_sale_flash', '<span class="onsale">' . esc_html__( 'Sale!', 'woocommerce' ) . '</span>', $post, $product ); ?>

Insert translation of the word:
<?php pll_e('Скидка'); ?>

Answer 1

<?php echo apply_filters( 'woocommerce_sale_flash', '<span class="onsale">' . pll__( 'Скидка' ) . '</span>', $post, $product ); ?

Answer 2

It is advisable to check before the output that polylang is activated, otherwise you will catch a fatal error

if ( is_plugin_active( 'polylang/polylang.php' ) ) {
  $sale = pll__( 'Скидка' );
} else {
  $sale = esc_html__( 'Sale!', 'woocommerce' );
}

echo apply_filters( 'woocommerce_sale_flash', '<span class="onsale">' . $sale . '</span>', $post, $product );