Remove theme editor submenu

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<?php
function remove_editor_menu() {
  remove_action('admin_menu', '_add_themes_utility_last', 101);
}
add_action('_admin_menu', 'remove_editor_menu', 1);
?>

Instructions:

WordPress has a built-in editor where you can edit the code in your plugins. This is probably nothing you want your clients to access, because just a few click could break the whole site.

To remove this, you can add the this snippet to functions.php.

Related links:

http://wp-snippets.com/32/disable-submenus-from-admin-panel/