chatbotbegriffe/ext_localconf.php

<?php

use TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider;
use TYPO3\CMS\Core\Imaging\IconRegistry;
use TYPO3\CMS\Core\Utility\GeneralUtility;

defined('TYPO3_MODE') || die();

call_user_func(
  function () {
      $iconRegistry = GeneralUtility::makeInstance(IconRegistry::class);
      
      $iconRegistry->registerIcon(
          'begriffe_list_record_icon',
          SvgIconProvider::class,
          ['source' => 'EXT:begriffmgt/Resources/Public/Icons/book.png']
      );

      $iconRegistry->registerIcon(
        'begriffe_module_icon',
        SvgIconProvider::class,
        ['source' => 'EXT:begriffmgt/Resources/Public/Icons/chatbot.svg']
    );
  }
);