You're almost there.
You are trying to assign 3 parameters using one object.
Something like this will do the trick.
var myVar = {
"iDisplayLength": 30,
"sPaginationType": "bootstrap",
"oLanguage": {
"sLengthMenu": "_MENU_ Einträge",
"sSearch": "Suche: ",
"sInfo": "Einträge _START_ bis _END_ von insgesamt _TOTAL_ angezeigt",
"oPaginate": {
"sPrevious": "Vorherige",
"sNext": "Nächste"
}
}
};
$('#sample_1').dataTable({
"aoColumns": [
{ "bSortable": true },
null,
null,
null,
{ "bSortable": false }
],
"aLengthMenu": [
[10, 30, 100, -1],
[10, 30, 100, "Alle"] // change per page values here
],
"iDisplayLength": myVar.iDisplayLength,
"sPaginationType" myVar.sPaginationType,
"oLanguage": myVar.oLanguage
});