title: Typo3 backend loads the frontend template
body: <p>I copied my own build extension to a new Typo3 installation but now the backend template is not generated correctly anymore. In the "old" installation it is still working. The extension has a configuration menu in the backend that uses the list template. It should load the following template:</p>
  
  <pre><code>/ext/resources/backend/customers/list.html
  </code></pre>
  
  <p>But the extension loads the following instead:</p>
  
  <pre><code>/ext/resources/customers/list.html
  </code></pre>
  
  <p>In the ext_tables.php it is registered as follow:</p>
  
  <pre><code>if (TYPO3_MODE === 'BE') {
  
      /**
       * Registers a Backend Module
       */
      \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerModule(
          'MTR.' . $_EXTKEY,
          'user',  // Make module a submodule of 'user'
          'mtcus',    // Submodule key
          '',                     // Position
          array(
              'Customers' =&gt; 'list',
          ),
          array(
              'access' =&gt; 'user,group',
              'icon'   =&gt; 'EXT:' . $_EXTKEY . '/ext_icon.gif',
              'labels' =&gt; 'LLL:EXT:' . $_EXTKEY . '/Resources/Private/Language/locallang_mtcus.xlf',
          )
      );
  }
  </code></pre>