[enh] transifex link added

searx/templates/about.html

@@ -36,6 +36,7 @@ Searx can be added to your browser's search bar; moreover, it can be set as the
     <li><a href="https://www.ohloh.net/p/searx/">ohloh</a></li>
     <li><a href="https://twitter.com/Searx_engine">twitter</a></li>
     <li>IRC: #searx @ freenode (<a href="https://kiwiirc.com/client/irc.freenode.com/searx">webclient</a>)</li>
+    <li><a href="https://www.transifex.com/projects/p/searx/">transifex</a></li>
 </ul>