update credits (remove icon part, add gnomus and bootstrap)

templates/guest_credits.html

@@ -1,14 +1,27 @@
-<div style="margin: 5px;">
-<h2>Source code</h2>
-<p>The original system was written by <a href="https://github.com/cookieBerlin/engelsystem">cookie</a>. It was then completely rewritten and greatly enhanced by <a href="http://notrademark.de/">msquare</a> and <a href="http://mortzu.de/">mortzu</a> of <a href="http://planetcyborg.de">planet cyborg</a> and <a href="http://jplitza.de/">jplitza</a>.</p>
-
-<h2>Hosting</h2>
-<p>Webspace, development platform and domain is currently provided by <a href="https://www.wybt.net/">would you buy this?</a> (ichdasich)<br />
-and adminstrated by <a href="http://mortzu.de/">mortzu</a>, <a href="http://derf.homelinux.org/">derf</a> and ichdasich.</p>
-
-<h2>Translation</h2>
-<p>Many thanks for the german translation: <a href="http://e7p.de">e7p</a></p>
-
-<h2>Icons</h2>
-<p>Some icons from the <a href="http://www.famfamfam.com/lab/icons/silk/">famfamfam.com silk iconset</a> have been used. They are licensed under the <a href="http://creativecommons.org/licenses/by/2.5/">Creative Commons Attribution 2.5 License</a>.</p>
-</div>
+<div class="container">
+<h1>Credits</h1>
+  <div class="row">
+    <div class="col-md-4">
+      <h2>Source code</h2>
+      <p>
+        The original system was written by <a href="https://github.com/cookieBerlin/engelsystem">cookie</a>. It was then completely rewritten and greatly enhanced by <a href="http://notrademark.de/">msquare</a> and <a href="http://mortzu.de/">mortzu</a> of <a href="http://planetcyborg.de">planet
+          cyborg</a>, <a href="http://jplitza.de/">jplitza</a> and gnomus.
+      </p>
+      <p>
+        Please look at the <a href="https://github.com/engelsystem/engelsystem/graphs/contributors">contributor list on github</a> for a more complete version.
+      </p>
+    </div>
+    <div class="col-md-4">
+      <h2>Hosting</h2>
+      <p>
+        Webspace, development platform and domain is currently provided by <a href="https://www.wybt.net/">would you buy this?</a> (ichdasich)<br /> and adminstrated by <a href="http://mortzu.de/">mortzu</a>, <a href="http://derf.homelinux.org/">derf</a> and ichdasich.
+      </p>
+    </div>
+    <div class="col-md-4">
+      <h2>Translation</h2>
+      <p>
+        Many thanks for the german translation: <a href="http://e7p.de">e7p</a>
+      </p>
+    </div>
+  </div>
+</div>