/usr/share/ktelepathy/styles/renkoo.AdiumMessageStyle/Contents/Resources/Outgoing/NextContext.html is in kde-telepathy-text-ui 4:15.12.3-0ubuntu1.
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 | <div class="x-followUp"></div>
<div>
%message%
<div class="x-timeStamp" title="%time{dd MMM yyyy}%">%time%</div>
</div>
<span id="insert"></span>
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