No CSS and JS in Advanced Configuration

we have no css and js editing in the admin panel,
what we have to do ?

This is a problem with a german translation string. You can change your langage to english to temporarly access to these settings.
You should report this bug here: (and mention this error that appears in the browser console when langage is deutsch: «ERROR Error: Unable to parse ICU expression in « {�0�, Plural, =1 {Bild im Cache} andere {Bilder im Cache}} » message.»)