how to change language for DataTable

//Spanish
$('#TableName').DataTable({
    "language": {
        "sProcessing":    "Procesando...",
        "sLengthMenu":    "Mostrar _MENU_ registros",
        "sZeroRecords":   "No se encontraron resultados",
        "sEmptyTable":    "Ningún dato disponible en esta tabla",
        "sInfo":          "Mostrando registros del _START_ al _END_ de un total de _TOTAL_ registros",
        "sInfoEmpty":     "Mostrando registros del 0 al 0 de un total de 0 registros",
        "sInfoFiltered":  "(filtrado de un total de _MAX_ registros)",
        "sInfoPostFix":   "",
        "sSearch":        "Buscar:",
        "sUrl":           "",
        "sInfoThousands":  ",",
        "sLoadingRecords": "Cargando...",
        "oPaginate": {
            "sFirst":    "Primero",
            "sLast":    "Último",
            "sNext":    "Siguiente",
            "sPrevious": "Anterior"
        },
        "oAria": {
            "sSortAscending":  ": Activar para ordenar la columna de manera ascendente",
            "sSortDescending": ": Activar para ordenar la columna de manera descendente"
        }
    }
});

Also using a cdn:

//cdn.datatables.net/plug-ins/a5734b29083/i18n/Spanish.json

More options: http://www.datatables.net/plug-ins/i18n/English [| Spanish | etc]

You have to either create a language file and then set it using :

"oLanguage": {
  "sUrl": "media/language/your_file.txt"
}

Im not sure what server language you are using but something like this would work in PHP :

"oLanguage": {
  "sUrl": "media/language/custom_lang_<?php echo $language ?>.txt"
}

Where language matches the file name for a specific language.

or change individual settings :

"oLanguage": {
  "sLengthMenu": "Display _MENU_ records per page",
  "sZeroRecords": "Nothing found - sorry",
  "sInfo": "Showing _START_ to _END_ of _TOTAL_ records",
  "sInfoEmpty": "Showing 0 to 0 of 0 records",
  "sInfoFiltered": "(filtered from _MAX_ total records)"
}

For more details read this : http://datatables.net/plug-ins/i18n