/usr/share/kde4/apps/ktelepathy/styles/simkete/Contents/Resources/Outgoing/NextContent.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 | <li class="NextOutgoingMessage" >%message%</li>
<!-- For support of consecutive messages -->
<div id="insert" />
|