Wowhead name->id problem

Hello,

It's me again. I have some trouble I can't fix with the function lootz_wowdb_id_lookup(). From what I understand, it creates a script to check the id in the url and it should work the same way with wowdb and wowhead. But it doesn't work for me with wowhead and I probably missed something.
The other way it works fine (when we provide an id into the [item][/item]) with some minor modifications.

For the interested I post my file that (half) works with wowhead in french. It works if you provide an id into the [item][/item] but not a name.

Thank you in advance for you help.