printf( _nx( 'One thought on “%2$s”', '%1$s thoughts on “%2$s”', get_comments_number(), 'comments title', 'twentyfifteen' ), number_format_i18n( get_comments_number() ), get_the_title() );

wp_list_comments() is located in wp-includes/comment-template.php https://core.trac.wordpress.org/browser/tags/4.1.1/src/wp-includes/comment-template.php#L2009 wp_list_comments args: twentyten: wp_list_comments( array( 'callback' => 'twentyten_comment' )); $avatar_size = 40; twentyeleven: wp_list_comments( array( 'callback' => 'twentyeleven_comment' )); // $avatar_size = 68; twentytwelve: wp_list_comments( array( 'callback' => 'twentytwelve_comment', 'style' => 'ol' )); $avatar_size = 44; ? twentythirteen: wp_list_comments( array( 'style' => 'ol', 'short_ping' => true, 'avatar_size' => 74 )); twentyfourteen: wp_list_comments( array( 'style' => 'ol', 'short_ping' => true, 'avatar_size'=> 34 )); twentyfifteen: wp_list_comments( array('style' => 'ol', 'short_ping' => true, 'avatar_size' => 56 )); TODO: avatar_size \wp-content\themes\%theme%\comments.php 'comment_list_el' => '#comments', 'comment_el' => 'li#comment-', 'list_container_class' => 'comment-list', 'children_class' => 'children', <... id="#comments> <... class='comment-list'> ... wp_list_comments( array( 'callback' => 'twentyten_comment' ) ); list comments callback \wp-content\themes\%theme%\functions.php::twentyten_comment()

...