A follow-up will be added though, because we understood why I had some javascript...

A follow-up will be added though, because we understood why I had some javascript error and jonathan didn't. It's because I've plack + debug
Bug 8117 follow-up: explicitely list tables to dataTable

debug panel in plack adds a lot of <table> (without any id)
thus, when you call
$("table").dataTable(...)
there's a javacscript error because datatable can't handle the plack <table> !

The solution has been to explicitely name the tables to dataTable (which is a good thing anyway)
        $("#activeperiodst,#inactiveperiodst").dataTable($.extend(true, {}, dataTablesDefaults, {