[FIX] web: strftimeToLuxonFormat escape character

The function `strftimeToLuxonFormat` used brackets as escape character,
which was the escape character of moment.

This commit changes the escape character to be quotes, which is the
correct escape character for luxon.

https://moment.github.io/luxon/#/formatting?id=escaping

closes odoo/odoo#123192

X-original-commit: d69201a6fe78dc22baed1cede04092aa2ed0bf0b
Signed-off-by: Lucas Lefèvre (lul) <lul@odoo.com>

addons/web/static/src/core/l10n/dates.js

@@ -246,7 +246,7 @@ export const strftimeToLuxonFormat = memoize(function strftimeToLuxonFormat(form
             if (inToken && normalizeFormatTable[character] !== undefined) {
                 character = normalizeFormatTable[character];
             } else {
-                character = "[" + character + "]"; // moment.js escape
+                character = "'" + character + "'";  // luxon escape
             }
         }
         output.push(character);

addons/web/static/tests/core/l10n/dates_tests.js

@@ -322,6 +322,24 @@ QUnit.module(
             unpatch(localization, "patch loc");
         });
 
+        QUnit.test("parseDateTime with escaped characters (eg. Basque locale)", async (assert) => {
+            const dateFormat = strftimeToLuxonFormat("%a, %Y.eko %bren %da");
+            const timeFormat = strftimeToLuxonFormat("%H:%M:%S");
+            patch(localization, "patch loc", {
+                dateFormat,
+                timeFormat,
+                dateTimeFormat: `${dateFormat} ${timeFormat}`,
+            });
+
+            const dateTimeFormat = `${dateFormat} ${timeFormat}`;
+            assert.equal(dateTimeFormat, "ccc, yyyy.'e''k''o' MMM'r''e''n' dd'a' HH:mm:ss");
+            assert.equal(
+                parseDateTime("1985-01-31 08:30:00").toFormat(dateTimeFormat),
+                "Thu, 1985.eko Janren 31a 08:30:00"
+            );
+            unpatch(localization, "patch loc");
+        });
+
         QUnit.test("parse smart date input", async (assert) => {
             patchDate(2020, 0, 1, 0, 0, 0); // 2020-01-01 00:00:00