<a4j:commandLink class="lien_detail" />
There is no attribute class for the component a4j:commandLink you should use styleClass instead.
Juste one more issue, the "please wait" message take much time, can I reduce this, please?
@Netmaster I don't see from where it is shown or hidden.
Not 100% sure but I think if it is slow it is because you are processing all the form (table and edit panel) when you are doing AJAX actions. I suggest usage of <a4j:region /> to right places and attribute execute="@region" on action buttons OR split in multiple forms avoiding nested forms.