Opening an external file containing javascript code

I'm trying to develop a PDF in two languages. When pushing a button, all questions and list-of-values for possible answers should be translated.

I created and initialized several variables with the two language phrases with javascript. Everything is inside my code.

Is there anyway that when a button is pressed an external file is read, bringing that javascript code for questions ans list-of-values? My concern is that currently I have a duplicated code, but if I want to implement three, four languages it will grow without control.

This is an example I wrote in my code:

var TxtAuxL1ESP = new Array();

var TxtAuxL1ING = new Array();

TxtAuxL1ESP[0]=", como ";

TxtAuxL1ING[0]=", such as ";

TxtAuxL1ESP[1]=": el último año ha obtenido ";

TxtAuxL1ING[1]=": last year it obtained ";

TxtAuxL1ESP[2]="%, en los últimos tres años ";

TxtAuxL1ING[2]="%, in the last three years ";

TxtAuxL1ESP[3]="% y en los últimos cinco años ";

TxtAuxL1ING[3]="% and in the last five years ";

//...

if (P1.BtnIdioma.border.edge.stroke == "raised") {

    var TxtAuxL1=TxtAuxL1ESP;

    var TxtAuxL2=TxtAuxL2ESP;

    var TxtAuxL3=TxtAuxL3ESP;

}

else {

    var TxtAuxL1=TxtAuxL1ING;

    var TxtAuxL2=TxtAuxL2ING;

    var TxtAuxL3=TxtAuxL3ING;

}

What I was thinking is to store TxtAuxL1ING in one file, TxtAuxL1ESP in another file and read them from my javascript code inside the PDF. Is it possible?

Regards

JC