Update string for Show/Hide in the tray

- be clear we don't "Show/Hide Bitcoins", but just the client window
- remove the tooltip for toggleHideAction as this is not shown anyway
- update a comment to be more general

src/qt/bitcoingui.cpp

@@ -273,8 +273,7 @@ void BitcoinGUI::createActions()
     optionsAction = new QAction(QIcon(":/icons/options"), tr("&Options..."), this);
     optionsAction->setToolTip(tr("Modify configuration options for Bitcoin"));
     optionsAction->setMenuRole(QAction::PreferencesRole);
-    toggleHideAction = new QAction(QIcon(":/icons/bitcoin"), tr("Show/Hide &Bitcoin"), this);
-    toggleHideAction->setToolTip(tr("Show or hide the Bitcoin window"));
+    toggleHideAction = new QAction(QIcon(":/icons/bitcoin"), tr("&Show / Hide"), this);
     exportAction = new QAction(QIcon(":/icons/export"), tr("&Export..."), this);
     exportAction->setToolTip(tr("Export the data in the current tab to a file"));
     encryptWalletAction = new QAction(QIcon(":/icons/lock_closed"), tr("&Encrypt Wallet..."), this);
@@ -463,7 +462,7 @@ void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
 {
     if(reason == QSystemTrayIcon::Trigger)
     {
-        // Click on system tray icon triggers "show/hide Bitcoin"
+        // Click on system tray icon triggers show/hide of the main window
         toggleHideAction->trigger();
     }
 }