Configurations

Hi, this is my first post, could’nt find any answers to my questions.
We are running jitsi on our own ubuntu 18.04 server

  1. How do I get the clock in the start screen (showing previous ) connections to show 24 hour clock.
  2. When we do a system update, why does certain config files get rewritten.
  3. I read that for certein thing to work you need prosody version 0.11, how do i get that, still have a 0.10 version.