Missing singular placeholder, needed for some languages. See https://codex.wordpress.org/I18n_for_WordPress_Developers#Plurals

Missing singular placeholder, needed for some languages. comments.php

Replace in comments.php: 
=======================
<?php
  printf( _nx( 'One comment', 'Comments: %1$s', get_comments_number(), 'comments title', 'urbanpointwp' ), number_format_i18n( get_comments_number() ), '<span>' . get_the_title() . '</span>' );
?>


With:
=======================
<?php
$comments_number = get_comments_number();
if ( '1' === $comments_number ) {
  /* translators: %s: post title */
  printf( _x( 'One Reply to &ldquo;%s&rdquo;', 'comments title', 'urbanpointwp' ), get_the_title() );
} else {
  printf(
    /* translators: 1: number of comments, 2: post title */
    _nx(
      '%1$s Reply to &ldquo;%2$s&rdquo;',
      '%1$s Replies to &ldquo;%2$s&rdquo;',
      $comments_number,
      'comments title',
      'urbanpointwp'
    ),
    number_format_i18n( $comments_number ),
    get_the_title()
  );
}
?>