Add Debian BTS usertags information and links.

wiki/src/contribute.html

@@ -39,6 +39,10 @@ this website into your native language, [[setup a mirror]]. Read on!
 
 	<p></p>
 
+	<ul>
+	  <li><a href="http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=tails-dev@boum.org">bugs that we are interested in on the Debian BTS</a></li>
+	</ul>
+
 	[[!map pages="contribute/*"]]
 
 </div> <!-- #other -->

wiki/src/contribute/relationship_with_upstream.mdwn

@@ -42,10 +42,33 @@ ship; in the rare cases we need to:
   by adding debconf options;
 - we intend to try to do this ourselves and submit patches to Debian.
 
+### Debian Bug tracking system
+
 We file and contribute to RFP and WNPP bugs so that software we need
 lands in Debian. More generally, we heavily use the Debian
 infrastructure such as the [BTS](http://bugs.debian.org/).
 
+We use usertags (documentation: [[!debwiki bugs.debian.org/usertags]],
+[reporting](http://www.debian.org/Bugs/Reporting)) to track bugs we
+are interested on the Debian BTS.
+
+There is a dynamically generated [list of our usertagged
+bugs](http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=tails-dev@boum.org).
+
+Our custom tags e.g. include:
+
+  - build-tools: live-build and other tools we use at build-time
+  - disk-space
+  - hardening: general kernel and toolchain hardening issues
+  - mandatory-access-control: [[todo/Mandatory_Access_Control]]
+  - privacy-violation
+  - iceweasel
+  - ui
+
+See our [bugs
+list](http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=tails-dev@boum.org)
+for the full and up-to-date list.
+
 ## Build tools
 
 We contribute to [Debian Live](http://live.debian.net/) on a regular