Date format 'F jS, Y' is not correct for non English languages

[giorgioriccardi]

Hi Morten,
I have a WP Italian site that uses Simone. The date was printed like in English st, nd or th in the 1st, 2nd or 15th
Since you smartly wrote the function pluggable if ( ! function_exists( 'simone_posted_on' ) ) : I've created a function in my child theme that overrides it:

 * Remove S from the date format for non English languages
 * [the English suffix for the day of the month st, nd or th in the 1st, 2nd or 15th]
 * http://php.net/manual/en/function.date.php
 */
function simone_posted_on() {
  $time_string = '<time class="entry-date published" datetime="%1$s">%2$s</time>';
  if ( get_the_time( 'U' ) !== get_the_modified_time( 'U' ) ) {
    $time_string .= '<time class="updated" datetime="%3$s">%4$s</time>';
  }

  $time_string = sprintf( $time_string,
    esc_attr( get_the_date( 'c' ) ),
    // esc_html( get_the_date( _x('F jS, Y', 'Public posted on date', 'simone') ) ), //original code
    esc_html( get_the_date( _x('F j, Y', 'Public posted on date', 'simone') ) ), //removed S
    esc_attr( get_the_modified_date( 'c' ) ),
    // esc_html( get_the_modified_date( _x('F jS, Y', 'Public modified on date', 'simone') ) ) //original code
    esc_html( get_the_modified_date( _x('F j, Y', 'Public modified on date', 'simone') ) ) //removed S
  );
        // Translators: Text wrapped in mobile-hide class is hidden on wider screens.
  printf( _x( '<span class="byline">Written by %1$s</span><span class="mobile-hide"> on </span><span class="posted-on">%2$s</span><span class="mobile-hide">.</span>', 'mobile-hide class is used to hide connecting elements like "on" and "." on wider screens.', 'simone' ),
    sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s">%2$s</a></span>',
      esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
      esc_html( get_the_author() )
    ),
                sprintf( '<a href="%1$s" rel="bookmark">%2$s</a>',
      esc_url( get_permalink() ),
      $time_string
    )
  );
}

This works, but unfortunately it also affects the English version. I was wondering if there is a way to implement date i18n into Simone core or child-theme function or if you can think of another solution.
Thanks