Convert Persian digits to English digits.

fa2EnDigits.js

fa2EnDigits(str) {
            str = String(str);
            var e = '۰'.charCodeAt(0);
            str = str.replace(/[۰-۹]/g, function (t) {
                return t.charCodeAt(0) - e;
            });
            e = '٠'.charCodeAt(0);
            str = str.replace(/[٠-٩]/g, function (t) {
                return t.charCodeAt(0) - e;
            });
            return str;
        },