[Bug]: Wrong Date/Time-Format in non-english environment (in Reservations_model.php)

[git-gnulf]

What happened?

In TI I changed the default language from english to german.
I reserve a table.
The system creates and sends to emails: one for the customer and one for the location
The emails arrives.
In both mails the date/time of the table reservation was included.
The date/time format in both emails are still in english format.
for example: Wednesday, 15. June 2022

What did you expect to happen?

If I set the default language to german, I expect the date/time format in the emails included are in german too.
For example: Mittwoch, 15. Juni 2022

Version

3.5.x

What browser are you seeing the problem on?

Firefox

Relevant log output

No response

[git-gnulf]

What I do to fix this:
edit /app/admin/models/Reservations_model.php
change function mailGetData()
and here switch from method format() to method isoFormat().

public function mailGetData()
    {
        $model = $this->fresh();

        $data = $model->toArray();
        $data['reservation'] = $model;
        $data['reservation_number'] = $model->reservation_id;
        $data['reservation_id'] = $model->reservation_id;

        // REMOVE
        // $data['reservation_time'] = Carbon::createFromTimeString($model->reserve_time)->format(lang('system::lang.php.time_format'));
        // $data['reservation_date'] = $model->reserve_date->format(lang('system::lang.php.date_format_long'));

        // ADD
        $data['reservation_time'] = Carbon::createFromTimeString($model->reserve_time)->isoFormat(lang('system::lang.moment.time_format'));
        $data['reservation_date'] = $model->reserve_date->isoFormat(lang('system::lang.moment.date_format'));
   : 
   : 
}