Release 2.3.0 (#4412)

- move user-preferences to edit submenu
- unify user preferences with other forms
- use light fieldset for all user-edit-forms
- support offcanvas elements
- allow to dynamically inject toolbar buttons (via plugins)
- use interface for formatting dates
- improve docker issue template
- bump version and composer packages

src/Utils/LocaleFormatter.php

@@ -11,7 +11,7 @@ namespace App\Utils;
 
 use App\Configuration\LocaleService;
 use App\Entity\Timesheet;
-use DateTime;
+use DateTimeInterface;
 use Exception;
 use IntlDateFormatter;
 use NumberFormatter;
@@ -195,7 +195,7 @@ final class LocaleFormatter
         return (string) $formatted;
     }
 
-    public function dateTime(DateTime|string|null $date): ?string
+    public function dateTime(DateTimeInterface|string|null $date): ?string
     {
         if ($date === null || $date === '') {
             return null;