Display error message text in mobile client

// be sure to add 'dojo/_base/lang' to AMD modules at the top

lang.extend(argos._EditBase, {
    getErrorMessage: function(error) {
        var message = this.errorText.general;

        if (error) {
            message = this.errorText.status[error.status] || this.errorText.general;

            var response = lang.getObject('xhr.responseText', false, error);
            if (response) {
                var errorObject = JSON.parse(response);
                if (Array.isArray(errorObject)) errorObject = errorObject[0];
                if (errorObject && errorObject.hasOwnProperty('message')) {
                    message = errorObject.message;
                }
            }
        }

        return message;
    }
});