Core/Chat: Fix a compile warning, locale is no longer used

src/server/game/Chat/Chat.cpp

@@ -374,7 +374,6 @@ bool ChatHandler::ExecuteCommandInTable(ChatCommand* table, const char* text, co
                     std::string zoneName = "Unknown";
                     if (AreaTableEntry const* area = GetAreaEntryByAreaID(areaId))
                     {
-                        int locale = GetSessionDbcLocale();
                         areaName = area->area_name;
                         if (AreaTableEntry const* zone = GetAreaEntryByAreaID(area->zone))
                             zoneName = zone->area_name;