clarified comment why we use an own progressbar style / included "~" in the tr() call

src/qt/bitcoingui.cpp

@@ -149,6 +149,7 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
     statusBar()->addPermanentWidget(frameBlocks);
 
     // define OS independent progress bar style (has to be placed after addWidget(), otherwise we crash)
+    // we did this, because with some OSes default style, text on the progress bar is unreadable
     progressBar->setStyleSheet("QProgressBar { background-color: transparent; border: 1px solid grey; border-radius: 2px; padding: 1px; text-align: center; } QProgressBar::chunk { background: QLinearGradient(x1: 0, y1: 0, x2: 1, y2: 0, stop: 0 #FF8000, stop: 1 orange); margin: 0px; }");
 
     syncIconMovie = new QMovie(":/movies/update_spinner", "mng", this);
@@ -474,7 +475,7 @@ void BitcoinGUI::setNumBlocks(int count)
         {
             progressBarLabel->setText(tr("Synchronizing with network..."));
             progressBarLabel->setVisible(true);
-            progressBar->setFormat("~" + tr("%n block(s) remaining", "", nRemainingBlocks));
+            progressBar->setFormat(tr("~%n block(s) remaining", "", nRemainingBlocks));
             progressBar->setMaximum(nTotalBlocks);
             progressBar->setValue(count);
             progressBar->setVisible(true);