翻译上传按钮标题

Hy all. I have a question: I added a file-upload plugin to my site (this one:http://danholloran.me/WPMultiFileUploader/) and it works great. I want to translate the upload button's text, (I'm using for translation Polylang) and for that I need to add the following code to make the plugin translate the string from the .mo file:

<?php echo __('Upload File(s)'); ?>

to the plugins minified .js file

text:{uploadButton:"Upload File(s)"}

I searched on the net and found out that in a .js file the php script wont run, so how can i replace the text from the .js file with my php code to make it work?

The .js file: http://we.tl/HDT0yiVSq1

(its a minified file unfortunately, but the text we search for is on the end of the file)

You can use $.get().

So:

$.get("phpfile.php", function(data){
    // initialize your upload and then use instead of "Upload File(s)" the variable data.
    // so uploadButton: data
});