/usr/share/kde4/apps/ktelepathy/styles/renkoo.AdiumMessageStyle/Contents/Resources/Header.html is in kde-telepathy-text-ui 0.3.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | <style type="text/css">
@import url(./Styles/Header.css);
</style>
<div id="x-heading">
<div class="x-conversationIncomingIcon"><img src="%incomingIconPath%" /></div>
<div class="x-conversationWith">%chatName%</div>
<div class="x-conversationTime">Conversation began %timeOpened%</div>
</div>
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