update language detection

src/Infrastructure/BotSharp.Core/Routing/Handlers/ResponseToUserRoutingHandler.cs

@@ -23,7 +23,7 @@ public class ResponseToUserRoutingHandler : RoutingHandlerBase, IRoutingHandler
         new ParameterPropertyDef("user_message_in_english",
             "Translate user message from non-English to English"),
         new ParameterPropertyDef("language",
-            "Language detected based on the latest message that USER sent, could be English, Spanish or Chinese.",
+            "User prefered language, considering the whole conversation. Language could be English, Spanish or Chinese.",
             required: true),
     };
 

src/Infrastructure/BotSharp.Core/Routing/Handlers/RouteToAgentRoutingHandler.cs

@@ -32,7 +32,7 @@ public class RouteToAgentRoutingHandler : RoutingHandlerBase, IRoutingHandler
         new ParameterPropertyDef("user_message_in_english",
             "Translate user message from non-English to English"),
         new ParameterPropertyDef("language",
-            "Language detected based on the latest message that USER sent, could be English, Spanish or Chinese.", 
+            "User prefered language, considering the whole conversation. Language could be English, Spanish or Chinese.", 
             required: true),
     };
 

src/Infrastructure/BotSharp.Core/Translation/TranslationService.cs

@@ -1,6 +1,7 @@
 using Amazon.Runtime.Internal.Transform;
 using BotSharp.Abstraction.Options;
 using BotSharp.Abstraction.Templating;
+using BotSharp.Abstraction.Translation;
 using BotSharp.Abstraction.Translation.Attributes;
 using Newtonsoft.Json;
 using System.Reflection;
@@ -28,16 +29,23 @@ public async Task<T> Translate<T>(Agent router, string messageId, T data, string
     {
         _router = router;
         _messageId = messageId;
+
+        var unique = new HashSet<string>();
+        Collect(data, ref unique);
+        if (unique.Count == 0)
+        {
+            return data;
+        }
+
         var cloned = data;
         if (clone)
         {
             cloned = Clone(data);
         }
 
-        var unique = new HashSet<string>();
-        Collect(cloned, ref unique);
         var map = await InnerTranslate(unique, language);
         cloned = Assign(cloned, map);
+
         return cloned;
     }
 

src/Infrastructure/BotSharp.Core/data/agents/01fcc3e5-9af7-49e6-ad7a-a760bd12dc4a/templates/planner_prompt.naive.liquid

@@ -10,3 +10,4 @@ Expected user goal agent is {{ expected_user_goal_agent }}.
 {%- else -%}
 User goal agent is inferred based on user initial request.
 {%- endif %}
+Detect language based on the overall content in [CONVERSATION] and only include user message.