[FIX] web: use dot or comma in date format

The new datepicker doesn't work properly with date formats using dots or
commas

Steps to reproduce:
1. Install Sales
2. Set the language date format to `%m.%d.%Y` and refresh the page
3. Open Sales and trigger the pivot view
4. Add a custom filter on field 'Delivery Date'
5. Click on the date to change it, the format changes
6. Try to enter a date, it is incorrectly parsed

Solution:
Add dot and comma as a possible character for static format

Problem:
Formats using dots were not considered as valid static format so the
value entered was parsed with the format `yyyy/MM/dd` instead

Partial backport of https://github.com/odoo/odoo/commit/5f17d8974652f9606cb57f909c143d15046f1854



opw-3222468

closes odoo/odoo#119235

Signed-off-by: Bruno Boi (boi) <boi@odoo.com>

addons/web/static/src/core/datepicker/datepicker.js

@@ -36,7 +36,7 @@ const luxonFormatToMomentFormat = (format) => {
  */
 const isValidStaticFormat = (format) => {
     try {
-        return /^[\d\s/:-]+$/.test(DateTime.local().toFormat(format));
+        return /^[\d\s\/.,:-]+$/.test(DateTime.local().toFormat(format));
     } catch (_err) {
         return false;
     }

addons/web/static/tests/core/datepicker_tests.js

@@ -509,6 +509,25 @@ QUnit.module("Components", () => {
         assert.verifySteps(["datetime-changed"]);
     });
 
+    QUnit.test("Datepicker works with dots and commas in format", async (assert) => {
+        assert.expect(2);
+
+        const picker = await mountPicker(DateTimePicker, {
+            props: {
+                date: DateTime.fromFormat("10/03/2023 13:14:27", "dd/MM/yyyy HH:mm:ss"),
+                format: "dd.MM,yyyy",
+            }
+        });
+
+        let input = picker.el.querySelector(".o_datepicker_input");
+
+        assert.strictEqual(input.value, "10.03,2023");
+
+        await click(input);
+
+        assert.strictEqual(input.value, "10.03,2023");
+    });
+
     QUnit.test('custom filter date', async function (assert) {
         assert.expect(3);
         class MockedSearchModel extends ActionModel {