shortcuts-window: Adapt to text direction

Makes the shortcuts windows display the right shortcut depending on the
text direction.
4 jobs for wip/aplazas/shortcuts-direction in 17 minutes and 2 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed flatpak:app #54585

00:11:43

 
  Test
passed flatpak:tests #54586

00:04:23

 
  Review
passed review #54587

00:00:30

passed stop_review #54588
manual

00:00:23