Display of times taking into account the time zones

The more Doxis is used in an international context, the more important it is to take time zones into account.

Currently, only the server time is displayed to all users. Switching is not possible These times make little sense for colleagues from Asia or America, as they always have to convert them themselves. This is not up to date. Depending on the user's location/profile, the time should be displayed in their time zone.