* upstream/main: (189 commits)
  Remove superfluos "=" on landing page
  Automatically update translation keys
  Improved tooltips (#788)
  Added high contrast mode (#759)
  Bump react-redux from 7.2.8 to 8.0.4
  Bump @mui/x-date-pickers from 5.0.0 to 5.0.4
  Bump @fortawesome/free-solid-svg-icons from 6.1.2 to 6.2.0
  Bump @types/node from 18.7.14 to 18.8.4
  Bump @mui/styles from 5.10.3 to 5.10.9
  Bump @mui/material from 5.10.3 to 5.10.9
  Bump luxon and @types/luxon
  Bump standardized-audio-context from 25.3.29 to 25.3.32
  Bump @date-io/date-fns from 2.15.0 to 2.16.0
  Bump @fortawesome/fontawesome-svg-core from 6.1.2 to 6.2.0
  Bump typescript from 4.8.2 to 4.8.4 (#798)
  update readme section How to cat a release for Opencast
  add cleanup workflow
  Automatically update translation keys
  Bump webvtt serializer to fix edge cases in serialization
  Fix subtitle serialization with undefined metadata values
  ...