Core: Cleanup locale handling.

It also fixes the recent problem of strange strings.

--HG--
branch : trunk

src/server/game/Entities/Object/Object.h

@@ -612,7 +612,7 @@ class WorldObject : public Object, public WorldLocation
         const char* GetName() const { return m_name.c_str(); }
         void SetName(const std::string& newname) { m_name=newname; }
 
-        virtual const char* GetNameForLocaleIdx(int32 /*locale_idx*/) const { return GetName(); }
+        virtual const char* GetNameForLocaleIdx(LocaleConstant /*locale_idx*/) const { return GetName(); }
 
         float GetDistance(const WorldObject *obj) const
         {