[gnome-shell] (19 commits) Non-fast-forward update to branch wip/carlosg/check-systemd

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/check-systemd' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  fca4c9f... shell: Check we are in a systemd environment before startin

Commits added to the branch:

  05485fe... extensions-app: Fix translatable string (*)
  e06109c... st/theme: Unref CRStylesheet after removing old theme nodes (*)
  a4cd9e0... Update Ukrainian translation (*)
  31cd8f7... appFavorites: Add eog to rename list (*)
  8ae3ed9... Update Chinese (Taiwan) translation (*)
  a41c1d4... Update Slovak translation (*)
  0397a10... Update Polish translation (*)
  e08a4ac... ibusManager: Fix the panel after porting to Promises (*)
  c291291... Add Ossetian translation (*)
  bf8b9ce... Updated Spanish translation (*)
  49605c7... shell/global: Watch for switcheroo-control appearing (*)
  9d7832e... shell/global: Make switcheroo-control available from JS (*)
  b170176... shell/global: Notify when switcheroo-control prop changes (*)
  3bfa991... appDisplay: Use global switcheroo-control D-Bus proxy (*)
  13dcd78... shell-app: Downgrade not finding a discrete GPU to debug (*)
  34da484... shell-app: Add PrefersNonDefaultGPU support to shell_app_la (*)
  c96af77... Updated Spanish translation (*)
  5223599... Update Ukrainian translation (*)
  8c6ea9b... shell: Check we are in a systemd environment before startin

(*) This commit already existed in another branch; no separate mail sent