Update importSettings() to call reloadSettings()

- PreferencesDialog::importSettings() calls MainWindow::reloadSettings() indirectly
- PreferencesDIalog::exportSettings() calls PreferencesDialog::saveSettings() when beginning
- Settings::importSettings() clear m_hCache
- Update Korean translation that can be translated from the above changes

src/PreferencesDialog.h

@@ -34,7 +34,7 @@ public:
 
 private slots:
     void loadSettings();
-    void saveSettings();
+    void saveSettings(bool accept=true);
 
     void chooseLocation();
     void showColourDialog(QTreeWidgetItem* item, int column);