Update mining thread combobox when lang changes

src/mainwindow.cpp

@@ -166,6 +166,21 @@ void MainWindow::retranslateMiningTab() {
         DEBUG("found start mining button");
         button2->setText( QObject::tr("Start Mining") );
     }
+
+    auto combo = tab->findChild<QComboBox *>("genproclimit");
+    if(combo != nullptr) {
+        DEBUG("found genproclimit combo");
+
+        int hwc = std::thread::hardware_concurrency();
+        // TODO: Is there a better way than recreating this combobox?
+        combo->clear();
+        auto threadStr  = tr("thread");
+        auto threadsStr = tr("threads");
+        // give options from 1 to hwc/2 , which should represent physical CPUs
+        for(int i=0; i < hwc/2; i++) {
+            combo->insertItem(i, QString::number(i+1) % " " % (i+1==1 ? threadStr : threadsStr));
+        }
+    }
 }
 
 // Called every time, when a menu entry of the language menu is called