title: TYPO3 Render FLUID Template in Backend
body: <p>I have an extbase extension with this TCA:</p>
  <pre><code>$GLOBALS['TCA']['tt_content']['types']['list']['previewRenderer']['items_item']
  = \Vendor\Name\Backend\Preview\PreviewRenderer::class;
  </code></pre>
  <p>and this tsconfig:</p>
  <pre><code>mod.web_layout.tt_content.preview.list.items_item = EXT:EXT/Resources/Private/Templates/Preview/Items.html
  </code></pre>
  <p>Everything works well if i write the complete Code in this template file. But if i change it and use Partials like  this:</p>
  <pre><code>&lt;f:render arguments=&quot;{_all}&quot; partial=&quot;Preview/List&quot;/&gt;
  </code></pre>
  <p>I only get the following error:</p>
  <pre><code>Error while rendering FluidTemplate preview using /typo3conf/ext/EXT/Resources/Private/Templates/Preview/Items.html The Fluid template files &quot;&quot; could not be loaded.
  </code></pre>
  <p>How can i set the Partial and Layout path?
  Ive tried ist with module via typoscript but it doesnt work.</p>