bug 85747, There is no difference between "OK" and "Cancel" when change Preferences | Fonts language,

r=matt, sr=blizzard

modules/libpref/src/init/all.js

@@ -386,8 +386,9 @@ pref("intl.charsetmenu.browser.cache",      "");
 pref("intl.charsetmenu.mailview.cache",     "");
 pref("intl.charsetmenu.composer.cache",     "");
 pref("intl.charsetmenu.browser.cache.size", 5);
-pref("intl.charset.detector",                "chrome://navigator/locale/navigator.properties");
+pref("intl.charset.detector",               "chrome://navigator/locale/navigator.properties");
 pref("intl.charset.default",                "chrome://navigator/locale/navigator.properties");
+pref("font.language.group",                 "chrome://navigator/locale/navigator.properties");
 
 // -- folders (Mac: these are binary aliases.)
 localDefPref("mail.signature_file",             "");

xpfe/components/prefwindow/resources/content/pref-fonts.js

@@ -43,7 +43,7 @@ var gPrefutilitiesBundle;
 // manual data retrieval function for PrefWindow
 function GetFields()
   {
-    var dataObject = [];
+    var dataObject = parent.hPrefWindow.wsm.dataManager.pageData["chrome://communicator/content/pref/pref-fonts.xul"];
 
     // store data for language independent widgets
     var lists = ["selectLangs", "proportionalFont"];

xpfe/components/prefwindow/resources/content/pref-fonts.xul

@@ -35,6 +35,11 @@
                 src="chrome://communicator/locale/pref/prefutilities.properties"/>
   <script type="application/x-javascript" 
           src="chrome://communicator/content/pref/pref-fonts.js"/>
+  <script type="application/x-javascript">
+  <![CDATA[
+    var _elementIDs = ["selectLangs"];
+  ]]>
+  </script>
 
   <hbox class="box-smallheader" title="&lHeader;"/>
   
@@ -44,7 +49,9 @@
             value="&language.label;" 
             accesskey="&language.accesskey;" 
             for="selectLangs"/>
-      <menulist id="selectLangs" class="small-margin" oncommand="selectLanguage();" persist="value">
+      <menulist id="selectLangs" class="small-margin" oncommand="selectLanguage();"
+                pref="true" preftype="localizedstring" prefstring="font.language.group"
+                prefattribute="value" wsm_attributes="value">
         <menupopup>
           <menuitem value="x-western" label="&font.langGroup.latin1;"/>
           <menuitem value="x-central-euro" label="&font.langGroup.latin2;"/>