Merge bitcoin-core/gui#420: Ensure translator comments end in full stop

5cc783f qt: ensure translator comments end in full stop (Jarol Rodriguez)

Pull request description:

  This is a follow-up to #318 which addresses this [nit](bitcoin-core/gui#318 (comment)) by addressing it globally.

  This ensures that all GUI translator comments end in a full stop. If a comment does not end in a full stop, a translator may think  that the rest of the comment is being cut off.

  While here, add a colon to the word "see" for any comments touched which point to look at a link.

ACKs for top commit:
  hebasto:
    ACK 5cc783f, I have reviewed the code and it looks OK, I agree it can be merged.
  shaavan:
    Code Review ACK 5cc783f

Tree-SHA512: 67a1d56175c974e0af9b460fa44163f7ce139a7b81cfaf8ed2c0e7fb6d5120957c3135d96010aeb6229689468e36673fe9571b5a8c3e1c07e047aba1bd563444

src/qt/addressbookpage.cpp

@@ -306,7 +306,7 @@ void AddressBookPage::on_exportButton_clicked()
     QString filename = GUIUtil::getSaveFileName(this,
         tr("Export Address List"), QString(),
         /*: Expanded name of the CSV file format.
-            See https://en.wikipedia.org/wiki/Comma-separated_values */
+            See: https://en.wikipedia.org/wiki/Comma-separated_values. */
         tr("Comma separated file") + QLatin1String(" (*.csv)"), nullptr);
 
     if (filename.isNull())

src/qt/qrimagewidget.cpp

@@ -133,7 +133,7 @@ void QRImageWidget::saveImage()
     QString fn = GUIUtil::getSaveFileName(
         this, tr("Save QR Code"), QString(),
         /*: Expanded name of the PNG file format.
-            See https://en.wikipedia.org/wiki/Portable_Network_Graphics */
+            See: https://en.wikipedia.org/wiki/Portable_Network_Graphics. */
         tr("PNG Image") + QLatin1String(" (*.png)"), nullptr);
     if (!fn.isEmpty())
     {

src/qt/transactionview.cpp

@@ -364,7 +364,7 @@ void TransactionView::exportClicked()
     QString filename = GUIUtil::getSaveFileName(this,
         tr("Export Transaction History"), QString(),
         /*: Expanded name of the CSV file format.
-            See https://en.wikipedia.org/wiki/Comma-separated_values */
+            See: https://en.wikipedia.org/wiki/Comma-separated_values. */
         tr("Comma separated file") + QLatin1String(" (*.csv)"), nullptr);
 
     if (filename.isNull())