GUACAMOLE-1364: Correct naming of SAML auth field and translation.

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-base/src/main/resources/translations/en.json

@@ -14,7 +14,7 @@
 
     "LOGIN" : {
         "FIELD_HEADER_ID_TOKEN"     : "",
-        "FIELD_HEADER_SAML"         : "",
+        "FIELD_HEADER_STATE"        : "",
         "FIELD_HEADER_TICKET"       : "",
         "INFO_IDP_REDIRECT_PENDING" : "Please wait, redirecting to identity provider..."
     }

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-saml/src/main/java/org/apache/guacamole/auth/saml/AuthenticationProviderService.java

@@ -110,7 +110,8 @@ public class AuthenticationProviderService {
         URI authUri = saml.createRequest();
         throw new GuacamoleInsufficientCredentialsException("Redirecting to SAML IdP.",
                 new CredentialsInfo(Arrays.asList(new Field[] {
-                    new RedirectField("samlRedirect", authUri, new TranslatableMessage("LOGIN.INFO_IDP_REDIRECT_PENDING"))
+                    new RedirectField(AUTH_SESSION_QUERY_PARAM, authUri,
+                            new TranslatableMessage("LOGIN.INFO_IDP_REDIRECT_PENDING"))
                 }))
         );