Bug 677010 - Show update channel on about: page r=callek ui-r=neil

suite/common/about.xhtml

@@ -8,6 +8,8 @@
 %aboutDTD;
 <!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd">
 %globalDTD;
+<!ENTITY % suiteAboutDTD SYSTEM "chrome://communicator/locale/about.dtd" >
+%suiteAboutDTD;
 ]>
 
 <!-- ***** BEGIN LICENSE BLOCK *****
@@ -66,6 +68,7 @@
   </div>
 
   <ul id="aboutPageList">
+    <li>&channel.description.start;<strong id="currentChannel">default</strong>&channel.description.end;</li>
     <li>&about.credits.beforeLink;<a href="about:credits">&about.credits.linkTitle;</a>&about.credits.afterLink;</li>
     <li>&about.license.beforeTheLink;<a href="about:license">&about.license.linkTitle;</a>&about.license.afterTheLink;</li>
     <li>&about.relnotes.beforeTheLink;<a id="releaseNotesURL" href="">&about.relnotes.linkTitle;</a>&about.relnotes.afterTheLink;</li>
@@ -105,7 +108,18 @@
         listItem.appendChild(document.createTextNode("&about.buildIdentifier;"));
         listItem.appendChild(document.createTextNode(ua));
       }
+
+      // Determine and display current channel.
+      try {
+        var updateChannel =
+            Components.classes["@mozilla.org/preferences-service;1"]
+                      .getService(Components.interfaces.nsIPrefService)
+                      .getDefaultBranch("")
+                      .getCharPref("app.update.channel");
+        document.getElementById("currentChannel").textContent = updateChannel;
+      } catch (ex) {}
     </script>
+
   </ul>
 
 </body>

suite/locales/en-US/chrome/common/about.dtd

@@ -0,0 +1,6 @@
+<!-- LOCALIZATION NOTE (channel.description.start,channel.description.end):
+     channel.description.start and channel.description.end create one sentence,
+     with the current channel label inserted in between.
+     example: You are currently on the _Stable_ update channel. -->
+<!ENTITY channel.description.start  "You are currently on the ">
+<!ENTITY channel.description.end    " update channel.">

suite/locales/jar.mn

@@ -42,6 +42,7 @@
   locale/@AB_CD@/communicator/utilityOverlay.properties                     (%chrome/common/utilityOverlay.properties)
   locale/@AB_CD@/communicator/viewZoomOverlay.dtd                           (%chrome/common/viewZoomOverlay.dtd)
   locale/@AB_CD@/communicator/viewZoomOverlay.properties                    (%chrome/common/viewZoomOverlay.properties)
+  locale/@AB_CD@/communicator/about.dtd                                     (%chrome/common/about.dtd)
   locale/@AB_CD@/communicator/aboutSessionRestore.dtd                       (%chrome/common/aboutSessionRestore.dtd)
   locale/@AB_CD@/communicator/aboutSyncTabs.dtd                             (%chrome/common/aboutSyncTabs.dtd)
   locale/@AB_CD@/communicator/bookmarks/bm-props.properties                 (%chrome/common/bookmarks/bm-props.properties)