On posts where comments are closed, the plugin will remove the text ‘Comments are closed.’ The plugin supports any languages/text domains, and will remove the text from themes and plugins.

Prerequisite: Since the plugin is filtering gettext, your theme/plugin must be localized.

The plugin is available in the WordPress plugin directory

Plugin source code:

<?php
/*
Plugin Name: Remove "Comments are closed"
Plugin URI: http://soderlind.no/archives/2012/01/11/wordpress-plugin-remove-comments-are-closed/
Description: On posts where comments are closed, the plugin will remove the text 'Comments are closed.' The plugin supports any languages/text domains, and will remove the text from themes and plugins.
Author: Per Soderlind
Version: 1.2
Author URI: http://soderlind.no/
*/

add_filter('gettext', 'ps_remove_comments_are_closed', 20, 3);

function ps_remove_comments_are_closed($translated_text, $untranslated_text, $domain) {
    if ( $untranslated_text == 'Comments are closed.' ) {
        return '';
    }
    return $translated_text;
}
?>

Changelog:

• 1.2 removed unnecessary code
• 1.1 initial public release