Merge bitcoin-core/gui#345: Connection Type Translator Comments

4832737 qt: connection type translator comments (Jarol Rodriguez)

Pull request description:

  This PR introduces Qt translator comments for `Connection Type` strings in `guiutil.cpp` as well as `rpcconsole.cpp`.

  This is an alternate implementation of the idea presented in the last three commits of dashpay#289. It is especially inspired by commit 842f4e834dfe5fd2786a5092f78ea28da1b36e4f.

  Per [Qt Dev Notes](https://github.com/bitcoin-core/bitcoin-devwiki/wiki/Developer-Notes-for-Qt-Code), it is better to not break up strings when not necessary. This way we preserve the full context for translators.

ACKs for top commit:
  jonatack:
    Code review re-ACK 4832737 per `git diff 371e2b9 4832737`, changes are translator comment edits since my review yesterday (thank you for updating)
  hebasto:
    ACK 4832737

Tree-SHA512: 67e1741e10a2e30cde6d50d3293eec89f0b7641b34463865dc6909d2926cdcf33a7d8c1dc8055d2f85906ad2002cdaa594d37b184d16e2f06614b6c5ad00c982

Author: hebasto

src/qt/guiutil.cpp

@@ -1673,14 +1673,26 @@ QString ConnectionTypeToQString(ConnectionType conn_type, bool prepend_direction
 {
     QString prefix;
     if (prepend_direction) {
-        prefix = (conn_type == ConnectionType::INBOUND) ? QObject::tr("Inbound") : QObject::tr("Outbound") + " ";
+        prefix = (conn_type == ConnectionType::INBOUND) ?
+                     /*: An inbound connection from a peer. An inbound connection
+                         is a connection initiated by a peer. */
+                     QObject::tr("Inbound") :
+                     /*: An outbound connection to a peer. An outbound connection
+                         is a connection initiated by us. */
+                     QObject::tr("Outbound") + " ";
     }
     switch (conn_type) {
     case ConnectionType::INBOUND: return prefix;
+    //: Peer connection type that relays all network information.
     case ConnectionType::OUTBOUND_FULL_RELAY: return prefix + QObject::tr("Full Relay");
+    /*: Peer connection type that relays network information about
+        blocks and not transactions or addresses. */
     case ConnectionType::BLOCK_RELAY: return prefix + QObject::tr("Block Relay");
+    //: Peer connection type established manually through one of several methods.
     case ConnectionType::MANUAL: return prefix + QObject::tr("Manual");
+    //: Short-lived peer connection type that tests the aliveness of known addresses.
     case ConnectionType::FEELER: return prefix + QObject::tr("Feeler");
+    //: Short-lived peer connection type that solicits known addresses from a peer.
     case ConnectionType::ADDR_FETCH: return prefix + QObject::tr("Address Fetch");
     } // no default case, so the compiler can warn about missing cases
     assert(false);

src/qt/rpcconsole.cpp

@@ -503,14 +503,28 @@ RPCConsole::RPCConsole(interfaces::Node& node, QWidget* parent, Qt::WindowFlags
 
     constexpr QChar nonbreaking_hyphen(8209);
     const std::vector<QString> CONNECTION_TYPE_DOC{
+        //: Explanatory text for an inbound peer connection.
         tr("Inbound: initiated by peer"),
+        /*: Explanatory text for an outbound peer connection that
+            relays all network information. This is the default behavior for
+            outbound connections. */
         tr("Outbound Full Relay: default"),
+        /*: Explanatory text for an outbound peer connection that relays
+            network information about blocks and not transactions or addresses. */
         tr("Outbound Block Relay: does not relay transactions or addresses"),
+        /*: Explanatory text for an outbound peer connection that was
+            established manually through one of several methods. The numbered
+            arguments are stand-ins for the methods available to establish
+            manual connections. */
         tr("Outbound Manual: added using RPC %1 or %2/%3 configuration options")
             .arg("addnode")
             .arg(QString(nonbreaking_hyphen) + "addnode")
             .arg(QString(nonbreaking_hyphen) + "connect"),
+        /*: Explanatory text for a short-lived outbound peer connection that
+            is used to test the aliveness of known addresses. */
         tr("Outbound Feeler: short-lived, for testing addresses"),
+        /*: Explanatory text for a short-lived outbound peer connection that is used
+            to request addresses from a peer. */
         tr("Outbound Address Fetch: short-lived, for soliciting addresses")};
     const QString list{"<ul><li>" + Join(CONNECTION_TYPE_DOC, QString("</li><li>")) + "</li></ul>"};
     ui->peerConnectionTypeLabel->setToolTip(ui->peerConnectionTypeLabel->toolTip().arg(list));