Change titleAttr in language file

hi
i must change language of dataTable in 3 language

i used this code:

            text:       '<i class="fa fa-print"></i>',
            titleAttr:  'Print',
            autoPrint:  true,
            extend:     'print',

And i need change titleAttr in Language file

i used this but cant change

"buttons": {
    "print": {
        "text": "test text",
        "titleAttr": "test titleAttr"
    }
}

please help me

thank you