when call qrr.settings.callback error raised

[phc2003]

qrcode-reader is a great plugin! ease to use!
When use data-qrr.settings.callback to set a callback function，raise some error like"Type Error: qrr.settings.callback is not a function....",I think "qrr.settings.callback(qrr.codes)" or "qrr.settings.callback(value)" (line 249 in qrcode-reader.js) can not treat as a function，so，I try to change code to "
var fn = window[qrr.settings.callback];
if (typeof (fn) === "function") {
fn(qrr.settings.multiple?qrr.codes:value);
}
",and it's run.

otherwise, It would be even better if then text "qrr-nodata" and "qrr-loading-message" (line 94/99 in qrcode-reader.js) can use localize parameters!