Language file include if change dialogue

hello, 

I change the dialogue of some plugins. How can I use the language file of the plugin here?

something like that

CKEDITOR.on('dialogDefinition', function(ev) {

    // does not work so
    var commonLang = ev.lang.common,
            linkLang = ev.lang.link;

   //........

   protocol[ 'items' ] = [
       [linkLang.toUrl, 'url'],
       [linkLang.toEmail, 'email']
    ];

});

is there a solution?

regards :)