Plone 5 and themes

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<p title="procedura di installazione">I'm testing the latest pre-release of plone (5.0a2), but after following the <a href="https://buildoutcoredev.readthedocs.org/en/latest/intro.html#setting-up-your-development-environment" title="procedura di installazione">installation procedure</a> (checkout, <span class="skimlinks-unlinked">bootstrap.py</span> and buildout) the theme configuration panel does not work.</p>
<p>To have it, you have to add to the file <strong><span