Translatable Javascript Strings: http://wptheming.com/2013/01/translatable-javascript-strings-in-wordpress/

gistfile1.php

<?php

function prefix_enqueue_custom_script(){
    wp_register_script( 'prefix_custom_script', plugin_dir_url( __FILE__ ) .'js/custom-script.js', array( 'jquery' ) );
    wp_enqueue_script( 'prefix_custom_script' );
    wp_localize_script( 'prefix_custom_script', 'optionsframework', array(
    'hello' => __( 'Hello', 'textdomain' ),
    'goodbye' => __( 'Good Bye', 'textdomain' )
    ) );
}