Qt: fix loading of language translation

But need always restart to apply change...

Based on http://qt-project.org/wiki/How_to_create_a_multi_language_application


Change-Id: I0f95afb68aa5b125e0707b0af1ce096dab9c29e4
Reviewed-on: https://code.wireshark.org/review/2286
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>

ui/qt/main_window.cpp

@@ -1545,6 +1545,25 @@ void MainWindow::updateForUnsavedChanges() {
 
 }
 
+void MainWindow::changeEvent(QEvent* event)
+{
+    if(0 != event)
+    {
+        switch(event->type())
+        {
+         // this event is send if a translator is loaded
+        case QEvent::LanguageChange:
+            main_ui_->retranslateUi(this);
+            break;
+        default:
+            break;
+        }
+
+    }
+
+     QMainWindow::changeEvent(event);
+}
+
 /* Update main window items based on whether there's a capture in progress. */
 void MainWindow::setForCaptureInProgress(gboolean capture_in_progress)
 {

ui/qt/main_window.h

@@ -377,6 +377,8 @@ private slots:
     void on_actionTelephonyRTSPPacketCounter_triggered();
     void on_actionTelephonySMPPOperations_triggered();
     void on_actionTelephonyUCPMessages_triggered();
+
+    void changeEvent(QEvent* event);
 };
 
 #endif // MAINWINDOW_H