[Qt] 2 minor translation changes

src/qt/bitcoin.cpp

@@ -359,7 +359,7 @@ void BitcoinApplication::requestShutdown()
     QWidget *shutdownWindow = new QWidget();
     QVBoxLayout *layout = new QVBoxLayout();
     layout->addWidget(new QLabel(
-        tr("Bitcoin Core is shutting down...\n") +
+        tr("Bitcoin Core is shutting down...") + "<br /><br />" +
         tr("Do not shut down the computer until this window disappears.")));
     shutdownWindow->setLayout(layout);