Drupal Bootstrap Menu Link Badges

bootstrap_menu_badges.php

<? 

function MODULE_preprocess_menu_link(array &$variables) {
    // Set your menu item here. Use the path you'd use to get to it via URL, no preceding slashes!
    $link_path = 'path/to/item';
    if ($variables['element']['#original_link']['link_path'] == $link_path) {
        // This is where you get the number or string that shows up in the badge
        $badge_count = MODULE_badge_count();
        if (!empty($badge_count)) {
            // Tell Drupal that this menu link contains HTML
            $variables['element']['#localized_options']['html'] = TRUE;
            // Create the HTML to be appended to the menu link
            $badge = '<span class="badge">' . $badge_count . '</span>'; // Badge HTML to add to menu item
            // Take the current menu link and set it equal to itself + the markup for the badge
            $variables['element']['#title'] = $variables['element']['#title'] . ' ' . $badge;
        }
    }
}