pjs/profile/resources/content/selectLang.xul

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://communicator/skin/"?>

<!DOCTYPE dialog SYSTEM "chrome://communicator/locale/profile/selectLang.dtd">

<dialog title="&langSelBox.title.label;"
        style="width: 22em;"
        onload="Startup();"
        ondialogaccept="return onAccept();"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <script type="application/x-javascript" src="chrome://communicator/content/profile/selectLang.js"/>
       
    <label value="&langList.txt.label;" control="langList"/>

    <separator class="thin" />
    
    <listbox id="langList" flex="1" rows="5" 
          ref="urn:mozilla:locale:root" datasources="rdf:chrome"
          sortResource="http://www.mozilla.org/rdf/chrome#name"
          sortDirection="ascending">
      
      <template xmlns:chrome="http://www.mozilla.org/rdf/chrome#">
        <rule chrome:localeType="region"/>
        <rule>
          <listitem id="treechildren" uri="..." 
                    label="rdf:http://www.mozilla.org/rdf/chrome#displayName"
                    value="rdf:http://www.mozilla.org/rdf/chrome#name"/>
        </rule>
      </template>
    </listbox>

    <separator class="thin" />

    <label value="&regionList.txt.label;" control="regionList"/>

    <separator class="thin" />
 
    <menulist id="regionList" flex="1">
      <menupopup
            datasources="rdf:chrome"  ref="urn:mozilla:locale:root" 
            sortResource="http://www.mozilla.org/rdf/chrome#name"
            sortDirection="ascending">
        <template xmlns:chrome="http://www.mozilla.org/rdf/chrome#">
          <rule chrome:localeType="region">
            <menuitem class="standard" uri="rdf:*" 
              label="rdf:http://www.mozilla.org/rdf/chrome#displayName"
              value="rdf:http://www.mozilla.org/rdf/chrome#name"/>
          </rule>
        </template>
      </menupopup>
    </menulist>             
</dialog>