Show the word 'thread' or 'threads' when selecting number of mining threads

src/mainwindow.cpp

@@ -1521,9 +1521,11 @@ void MainWindow::setupMiningTab() {
         auto combo      = new QComboBox(tab);
         combo->setObjectName("genproclimit");
 
+        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));
+            combo->insertItem(i, QString::number(i+1) % " " % (i+1==1 ? threadStr : threadsStr));
         }
 
         QFont font;