Issue 2136 - Update web.adblockplus.org content for specifying default translations inline

includes/preftable.tmpl

 {#
  # This file is part of the Adblock Plus website,
  # Copyright (C) 2006-2015 Eyeo GmbH
  #
  # Adblock Plus is free software: you can redistribute it and/or modify
  # it under the terms of the GNU General Public License version 3 as
  # published by the Free Software Foundation.
  #
  # Adblock Plus is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  #}
 
 {% macro display_preftable(preftable, links) %}
   <table id="preftable">
     <tbody>
       <tr>
-        <th width="30%">{{ "prefnamecol"|translate }}</th>
-        <th width="20%">{{ "defaultcol"|translate }}</th>
-        <th width="50%">{{ "descriptioncol"|translate }}</th>
+        <th width="30%">{{ "Preference"|translate("prefnamecol") }}</th>
+        <th width="20%">{{ "Default value"|translate("defaultcol") }}</th>
+        <th width="50%">{{ "Comments"|translate("descriptioncol") }}</th>
       </tr>
       {% for section in preftable %}
         <tr id="{{ section.id }}">
           <td class="section" colspan="3">{{ section.title }}</td>
         </tr>
         {% for preference in section.preferences %}
           <tr id="{{ preference.name }}">
             <td>
               <span>extensions.</span>
               <span>adblockplus.</span>
               <span class="prefname">{{ preference.name }}</span>
             </td>
             {% if preference.default %}
               <td>{{ preference.default }}</td>
             {% elif preference.default is none or
                     preference.default is undefined %}
               <td><em>empty</em></td>
             {% else %}
               <td>&nbsp</td>
             {% endif %}
             <td>{{ preference.description() }}</td>
           </tr>
         {% endfor %}
       {% endfor %}
     </tbody>
   </table>
 {% endmacro %}