Fix missing translation in NPC trade denial reason

src/npc.cpp

@@ -1864,7 +1864,7 @@ ret_val<void> npc::wants_to_buy( const item &it, int at_price ) const
 
     icg_entry const *bl = myclass->get_shopkeeper_blacklist().matches( it, *this );
     if( bl != nullptr ) {
-        return ret_val<void>::make_failure( bl->message );
+        return ret_val<void>::make_failure( bl->message.translated() );
     }
 
     // TODO: Base on inventory

src/npc_class.cpp

@@ -252,7 +252,7 @@ std::string shopkeeper_item_group::get_refusal() const
         return _( "<npcname> does not trust you enough" );
     }
 
-    return refusal;
+    return refusal.translated();
 }
 
 void shopkeeper_item_group::deserialize( const JsonObject &jo )

src/npc_class.h

@@ -51,7 +51,7 @@ struct shopkeeper_item_group {
     item_group_id id = item_group_id( "EMPTY_GROUP" );
     int trust = 0;
     bool strict = false;
-    std::string refusal;
+    translation refusal;
     std::function<bool( dialogue & )> condition;
 
     // Rigid shopkeeper groups will be processed a single time. Default groups are not rigid, and will be processed until the shopkeeper has no more room or remaining value to populate goods with.

src/shop_cons_rate.h

@@ -17,7 +17,7 @@ struct icg_entry {
     itype_id itype;
     item_category_id category;
     item_group_id item_group;
-    std::string message;
+    translation message;
 
     std::function<bool( dialogue & )> condition;