diff -up kdelibs-4.8.4/khtml/ecma/kjs_navigator.cpp.me kdelibs-4.8.4/khtml/ecma/kjs_navigator.cpp
--- kdelibs-4.8.4/khtml/ecma/kjs_navigator.cpp.me	2012-06-06 22:49:52.542044112 +0200
+++ kdelibs-4.8.4/khtml/ecma/kjs_navigator.cpp	2012-07-12 11:52:50.973049316 +0200
@@ -261,7 +261,13 @@ JSValue *Navigator::getValueProperty(Exe
   case BrowserLanguage:
   case Language:
   case UserLanguage:
-    return jsString(KGlobal::locale()->language());
+  {
+    QString l =  KGlobal::locale()->language();
+    if ( l.contains(QLatin1Char('_')) )
+      return jsString(l.replace(QLatin1Char('_'), QLatin1Char('-')));
+    else
+      return jsString(l + QLatin1Char('-') + KGlobal::locale()->country().toUpper());
+  }
   case UserAgent:
     return jsString(userAgent);
   case Platform: