Update text of start/stop mining buttons when language changes

src/mainwindow.cpp

@@ -150,6 +150,21 @@ void MainWindow::retranslateMiningTab() {
     if(tab != nullptr) {
         DEBUG("found Mining tab");
         ui->tabWidget->setTabText(ui->tabWidget->indexOf(tab), QObject::tr("Mining"));
+    } else {
+        DEBUG("no Mining tab found!");
+        return;
+    }
+
+    auto button1 = tab->findChild<QPushButton *>("stopmining");
+    if(button1 != nullptr) {
+        DEBUG("found stop mining button");
+        button1->setText( QObject::tr("Stop Mining") );
+    }
+
+    auto button2 = tab->findChild<QPushButton *>("startmining");
+    if(button2 != nullptr) {
+        DEBUG("found start mining button");
+        button2->setText( QObject::tr("Start Mining") );
     }
 }