Feature: #98394 - Introduce event to prevent downloading of language packs

services:
  MyVendor\MyExtension\EventListener\ModifyLanguagePacks:
    tags:
      - name: event.listener
        identifier: 'modifyLanguagePacks'
        event: TYPO3\CMS\Install\Service\Event\ModifyLanguagePacksEvent
        method: 'modifyLanguagePacks'

<?php
namespace MyVendor\MyExtension\EventListener;

use TYPO3\CMS\Install\Service\Event\ModifyLanguagePacksEvent;

final class ModifyLanguagePacks
{
    public function modifyLanguagePacks(ModifyLanguagePacksEvent $event): void
    {
        $extensions = $event->getExtensions();
        foreach ($extensions as $key => $extension){
            if($extension['type'] === 'typo3-cms-framework'){
                $event->removeExtension($key);
            }
        }
        $event->removeIsoFromExtension('de', 'styleguide');
    }
}