In Odoo 10.0 (Enterprise) POS I currently cannot use the numpad comma on a german keyboard.

the keyboard_handler function in the init function for the PaymentScreenWidget is defined like this:

                } else if ( event.keyCode === 190 || // Dot
                            event.keyCode === 110 ||  // Decimal point (numpad)
                            event.keyCode === 188 ||  // Comma
                            event.keyCode === 46 ) {  // Numpad dot
                    key = self.decimal_point;

The keyCode for the (numpad) comma is 44 which is not handled by this. How would I go about changing this? I wrote a module which at first tried to extend the PaymentScreenWidget init function like this:

odoo.define('fd_pos_mod.screens', function (require) {
    "use strict";
    var screens = require('point_of_sale.screens');

    screens.PaymentScreenWidget.extend({
        init: function(parent, options) {
            var self = this;
            this._super(parent, options);

            // This keyboard handler listens for keypress events. It is
            // also called explicitly to handle some keydown events that
            // do not generate keypress events.
            this.keyboard_handler = function(event){
                var key = '';

                if (event.type === "keypress") {
                    if (event.keyCode === 13) { // Enter
                        self.validate_order();
                    } else if ( event.keyCode === 190 || // Dot
                                event.keyCode === 110 ||  // Decimal point (numpad)
                                event.keyCode === 188 ||  // Comma
                                event.keyCode === 46 || // Numpad dot
                                event.keyCode === 44) {  // Numpad comma
                        key = self.decimal_point;
                    } else if (event.keyCode >= 48 && event.keyCode <= 57) { // Numbers
                        key = '' + (event.keyCode - 48);
                    } else if (event.keyCode === 45) { // Minus
                        key = '-';
                    } else if (event.keyCode === 43) { // Plus
                        key = '+';
                    }
                } else { // keyup/keydown
                    if (event.keyCode === 46) { // Delete
                        key = 'CLEAR';
                    } else if (event.keyCode === 8) { // Backspace
                        key = 'BACKSPACE';
                    }
                }

                self.payment_input(key);
                event.preventDefault();
            };
        },
    });
});

I could see my .js being loaded but it didn't do anything. Then I tried overloading the prototype of PaymentScreenWidget like this:

odoo.define('fd_pos_mod.screens', function (require) {
    "use strict";
    var screens = require('point_of_sale.screens');

    screens.PaymentScreenWidget.prototype.init = function(parent, options) {
        init: function(parent, options) {
            var self = this;
            this._super(parent, options);

            this.pos.bind('change:selectedOrder',function(){
                    this.renderElement();
                    this.watch_order_changes();
                },this);
            this.watch_order_changes();

            this.inputbuffer = "";
            this.firstinput  = true;
            this.decimal_point = _t.database.parameters.decimal_point;

            // This is a keydown handler that prevents backspace from
            // doing a back navigation. It also makes sure that keys that
            // do not generate a keypress in Chrom{e,ium} (eg. delete,
            // backspace, ...) get passed to the keypress handler.
            this.keyboard_keydown_handler = function(event){
                if (event.keyCode === 8 || event.keyCode === 46) { // Backspace and Delete
                    event.preventDefault();

                    // These do not generate keypress events in
                    // Chrom{e,ium}. Even if they did, we just called
                    // preventDefault which will cancel any keypress that
                    // would normally follow. So we call keyboard_handler
                    // explicitly with this keydown event.
                    self.keyboard_handler(event);
                }
            };

            // This keyboard handler listens for keypress events. It is
            // also called explicitly to handle some keydown events that
            // do not generate keypress events.
            this.keyboard_handler = function(event){
                var key = '';

                if (event.type === "keypress") {
                    if (event.keyCode === 13) { // Enter
                        self.validate_order();
                    } else if ( event.keyCode === 190 || // Dot
                                event.keyCode === 110 ||  // Decimal point (numpad)
                                event.keyCode === 188 ||  // Comma
                                event.keyCode === 46 || // Numpad dot
                                event.keyCode === 44) {  // Numpad comma
                        key = self.decimal_point;
                    } else if (event.keyCode >= 48 && event.keyCode <= 57) { // Numbers
                        key = '' + (event.keyCode - 48);
                    } else if (event.keyCode === 45) { // Minus
                        key = '-';
                    } else if (event.keyCode === 43) { // Plus
                        key = '+';
                    }
                } else { // keyup/keydown
                    if (event.keyCode === 46) { // Delete
                        key = 'CLEAR';
                    } else if (event.keyCode === 8) { // Backspace
                        key = 'BACKSPACE';
                    }
                }

                self.payment_input(key);
                event.preventDefault();
            };

            this.pos.bind('change:selectedClient', function() {
                self.customer_changed();
            }, this);
        },
    };
});

Still no dice. Can anyone tell me what I'm doing wrong? Or better yet, tell me how to do it correctly? :)