Steps to reproduce the issue

When installing an extension, the title, copyright and license are put in 1 <div class="span12"></div>, then the description is put in another <div class="span12"></div>, resulting in the following:

<div class="span12">
    <h1>Title</h1>
    <p>Copyright</p>
    <p>license</p>
</div>
<div class="span12">
    <p>description</p>
</div>

This then result in the 2nd <div class="span12"></div> getting a left margin and pushing the container outside the viewport:

Expected result

The span12 div's should be wrapped by <div class="row-fluid"></div> like so:

<div class="row-fluid">
    <div class="span12">
        <h1>Title</h1>
        <p>Copyright</p>
        <p>license</p>
    </div>
</div>
<div class="row-fluid">
    <div class="span12">
        <p>description</p>
    </div>
</div>

System information (as much as possible)

• Joomla staging