Desktop client uses UTC and not the timezone set in my operating system nor the settings from Nextcloud

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Steps to reproduce

1. Try to schedule a meeting within the a talk room with the desktop client
2. The time you chose will be stored in UTC on the Nextcloud server and the dialog let me chose 0-12h am/pm while my locals on the operating system and on Nextcloud are set to Germany and 24h-format.

Expected behaviour

reuse the locals and timezone either from my Nextcloud settings or from the operating system. For most people they should be the same

Actual behaviour

It uses UTC and 12h-format

Talk Desktop Client Version 1.2.3 (flatpak on Linux)

Start at the desktop client's meeting-scheduling dialog and trace how the selected time is formatted and stored on the Nextcloud server. Check how the operating-system and Nextcloud locale/timezone settings are exposed to the client; done means the dialog uses the configured timezone and 24-hour format instead of UTC and 12-hour formatting.