After some inspection on default JIRA pages as workaround I did it like this:
<html>
<head>
<!-- the following must be present to keep the partial view only.
at first I tried atl.popup as suggested in the docs, but it did not work -->
<meta name="decorator" content="dialog">
</head>
<body>
...
The response is now clear from head tags and whatnot, but there are some other lines added:
<div class="jira-dialog-content">
<div class="dialog-title hidden"></div>
which is not a big deal - I can filter them client side with some jQuery.
Still, I'm not sure that's the "official" way to achieve the desired behavior...
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