Fix phrasing of error for handshake verion mismatches

The parameters were never been filled because the server does not produce its version in the handshake message. This
could be fixed, but comes with BC concerns so I just fixed the strings for now.

src/main/java/net/rptools/maptool/server/ClientHandshake.java

@@ -25,6 +25,7 @@
 import java.security.SecureRandom;
 import java.security.spec.InvalidKeySpecException;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionException;
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.ExecutionException;
 import java.util.function.BiConsumer;
@@ -91,7 +92,15 @@ public ClientHandshake(MapToolClient client, Connection connection) {
 
   @Override
   public void whenComplete(BiConsumer<? super Void, ? super Throwable> callback) {
-    stage = stage.whenComplete(callback);
+    stage =
+        stage.whenComplete(
+            (result, error) -> {
+              // Hand back the original exception, not the wrapped one.
+              if (error instanceof CompletionException e) {
+                error = e.getCause();
+              }
+              callback.accept(result, error);
+            });
   }
 
   private void setCurrentState(State state) {

src/main/resources/net/rptools/maptool/language/i18n.properties

@@ -406,7 +406,7 @@ GridlessGrid.error.notLoaded = Could not load gridless grid footprints.
 Handshake.msg.duplicateName = Someone is already using that player name.  Please choose another name and try again.
 Handshake.msg.wrongPassword = You entered the wrong password.  Please try again.
 Handshake.msg.unknownPlayer = Player {0} is unknown.
-Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client running version {0} to a server running version {1}.<br> Please update your client to the correct version.
+Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client to a server running a different version.<br> Please update your client to the correct version.
 Handshake.msg.failedLogin   = Failed login attempt from {0}, errors decoding handshake follow.
 Handshake.msg.failedLoginDecode = Failed decoding handshake with password.
 Handshake.msg.encodeInitFail = Failed to initialize encoding for handshake.

src/main/resources/net/rptools/maptool/language/i18n_en.properties

@@ -412,7 +412,7 @@ GridlessGrid.error.notLoaded = Could not load gridless grid footprints.
 Handshake.msg.duplicateName = Someone is already using that player name.  Please choose another name and try again.
 Handshake.msg.wrongPassword = You entered the wrong password.  Please try again.
 Handshake.msg.unknownPlayer = Player {0} is unknown.
-Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client running version {0} to a server running version {1}.<br> Please update your client to the correct version.
+Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client to a server running a different version.<br> Please update your client to the correct version.
 Handshake.msg.failedLogin   = Failed login attempt from {0}, errors decoding handshake follow.
 Handshake.msg.failedLoginDecode = Failed decoding handshake with password.
 Handshake.msg.encodeInitFail = Failed to initialize encoding for handshake.

src/main/resources/net/rptools/maptool/language/i18n_en_au.properties

@@ -407,7 +407,7 @@ GridlessGrid.error.notLoaded = Could not load gridless grid footprints.
 Handshake.msg.duplicateName = Someone is already using that player name.  Please choose another name and try again.
 Handshake.msg.wrongPassword = You entered the wrong password.  Please try again.
 Handshake.msg.unknownPlayer = Player {0} is unknown.
-Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client running version {0} to a server running version {1}.<br> Please update your client to the correct version.
+Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client to a server running a different version.<br> Please update your client to the correct version.
 Handshake.msg.failedLogin   = Failed login attempt from {0}, errors decoding handshake follow.
 Handshake.msg.failedLoginDecode = Failed decoding handshake with password.
 Handshake.msg.encodeInitFail = Failed to initialize encoding for handshake.

src/main/resources/net/rptools/maptool/language/i18n_en_gb.properties

@@ -407,7 +407,7 @@ GridlessGrid.error.notLoaded = Could not load gridless grid footprints.
 Handshake.msg.duplicateName = Someone is already using that player name.  Please choose another name and try again.
 Handshake.msg.wrongPassword = You entered the wrong password.  Please try again.
 Handshake.msg.unknownPlayer = Player {0} is unknown.
-Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client running version {0} to a server running version {1}.<br> Please update your client to the correct version.
+Handshake.msg.wrongVersion  = The versions used do not match. You are trying to connect a client to a server running a different version.<br> Please update your client to the correct version.
 Handshake.msg.failedLogin   = Failed login attempt from {0}, errors decoding handshake follow.
 Handshake.msg.failedLoginDecode = Failed decoding handshake with password.
 Handshake.msg.encodeInitFail = Failed to initialize encoding for handshake.