Add additional logging

* Log server connection failure
* More info on template substitution failure

src/net/sf/freecol/client/control/ConnectController.java

@@ -101,6 +101,9 @@ public final class ConnectController extends FreeColClientHolder {
                 err = StringTemplate.template("server.couldNotConnect");
             }
         } catch (Exception ex) {
+            logger.severe("Server could not connect to "
+                    + host + ":" + port
+                    + " as " + user);
             err = FreeCol.errorFromException(ex, "server.couldNotConnect");
         }
         return err;

src/net/sf/freecol/common/i18n/Messages.java

@@ -869,7 +869,8 @@ public class Messages {
                     } else {
                         logger.warning("Choice substitution for "
                             + selector + "/" + otherKey
-                            + " attempted, but template was " + replacement);
+                            + " attempted, but template was " + replacement
+                            + " for input " + input);
                         continue;
                     }
                 } else if (containsKey(otherKey)) {