[Simple Slug Translate] Customize the translated slug.

functions.php

/**
 * Customize the translated slug.
 */
add_filter( 'simple_slug_translate_results', function( $results ) {
    // 200 - OK
    if ( 200 === $results['code'] ) {
        // Customize slug
        $results['text'] = sprintf( 'translated-%s', $results['text'] );
    }

    return $results;
} );