diff -urN kde-workspace-4.10.3/kdm/kcm/kdm-gen.cpp kde-workspace-4.10.3-patched/kdm/kcm/kdm-gen.cpp
--- kde-workspace-4.10.3/kdm/kcm/kdm-gen.cpp	2013-05-03 15:36:45.000000000 +1100
+++ kde-workspace-4.10.3-patched/kdm/kcm/kdm-gen.cpp	2013-05-28 01:23:48.374492633 +1100
@@ -35,6 +35,8 @@
 #include <QFormLayout>
 #include <QVBoxLayout>
 
+#include <locale.h>
+
 extern KConfig *config;
 
 KDMGeneralWidget::KDMGeneralWidget(QWidget *parent)
@@ -208,7 +210,21 @@
     colcombo->setCurrentId(configGrp.readEntry("ColorScheme"));
 
     // get the language
-    langcombo->setCurrentItem(configGrp.readEntry("Language", "C"));
+    QString langEntry = configGrp.readEntry("Language", "C");
+    if ((langEntry == "C") || !langcombo->contains(langEntry))
+    {
+        char *locale = setlocale(LC_MESSAGES, NULL);
+
+        QString lang, country, modifier, charset;
+        KLocale::splitLocale(locale, lang, country, modifier, charset);
+
+        if (lang.toLower() == country.toLower())
+            langEntry = lang;
+        else
+            langEntry = lang + "_" + country;
+    }
+
+    langcombo->setCurrentItem(langEntry);
 
     // Read the fonts
     QFont font = stdFontChooser->font();