The translated pages don’t appear in the list of pages either. Only if I deactivate polylang the translated pages appear under pages.
I found that ‘detect browser language’ was activated by default (I hate this). Anyway I deactivated detect browser language because I thought this might be the reason that I cannot find translated pages in the backend. Unfortunately it didn’t change anything. If I deactivate polylang I can see and edit the pages in the backend. If a activate polylang translated pages won’t appear in the list of pages.